The factor structure of the Hopkins Symptom Checklist 25 among persons seeking HIV testing.

Rates of anxiety and depression are high among individuals living with HIV. The Hopkins Symptom Checklist (HSCL) is a screening tool to identify symptoms of depression and anxiety. The objective of this study was to determine the factor structure of the 25-item HSCL in a population-based sample of individuals seeking HIV testing in the Western Cape in South Africa. Participants volunteered for HIV testing at two non-medical HIV testing sites in the Western Cape. We used convenience sampling to administer the scale prior to their undergoing HIV testing. Data were analysed using exploratory factor analysis, using an extraction method of principal components with Promax (oblique) rotation. The Cronbach's alpha reliability indices were calculated for each of the independent factors to determine internal consistency. Factor analysis revealed a three-factor structure that explained 56.86% of the total variance. These factors included depression (14 items), anxiety (7 items) and somatic symptoms (4 items). Alpha levels ranged from 0.67 to 0.94. We found that the HSCL is a reliable measure for depression and anxiety, and consists of 3 distinguishable factors depression, anxiety, and somatic symptoms.

Psychometric evaluation of the United States-adapted perceived perioperative competence scale-revised: A national survey.

Background: Nursing competence is integral to ensuring patient safety, especially in high-risk environments such as the operating room. Instruments which facilitate self-assessment of specialty specific nursing competence allow nurses to gain important insights into their practice to facilitate continuous growth in their professional practice. Currently, there are no psychometrically tested tools to assess perioperative competence applicable to the United States context. Objective: Test the psychometric properties of the Perceived Perioperative Competence Scale-Revised in the United States context. Methods: A cross-sectional survey design was used. Perioperative nurses were recruited via four professional associations and the survey was administered online. Construct validity of the six-dimensional Perceived Perioperative Competence Scale-Revised was tested using a multidimensional item response theory model known as the graded response model. Measurement invariance was assessed relative to years of perioperative experience. Internal consistency was estimated using McDonald's Omega and Cronbach's alpha reliability coefficients. Results: Responses from a total of 1,581 participants were analyzed in the psychometric analysis. The six-dimensional graded response model of the Perceived Perioperative Competence Scale-Revised displayed satisfactory model fit for the sample (Chi-square(df) = 5,699.09(725); root mean square error of approximation = 0.066, 90% confidence interval: 0.064, 0.067; comparative fit index = 0.955; Tucker-Lewis index = 0.952; standardized root mean squared residual = 0.045). Scalar invariance was established when assessing the psychometric equivalence of the scale across years of perioperative experience (<10 years, ≥ 10 years) (Chi-square(df) = 5,785.29(1,573); root mean square error of approximation = 0.058, 90% confidence interval: 0.057, 0.060; comparative fit index = 0.959; Tucker-Lewis index = 0.959). Reliability across the six subscales ranged from alpha = 0.87 - 0.94 and Omega = 0.93 - 0.97. Conclusions: Results suggest that the Perceived Perioperative Competence Scale-Revised is suitable to use with perioperative nurses practicing in clinical settings in the United States. Measurement invariance testing indicates the scale is measuring the same construct and is being interpreted in a conceptually similar manner across groups based on years of perioperative experience.

Factor structure of posttraumatic stress disorder (PTSD) in persons with serious mental illness.

BACKGROUND: Trauma and posttraumatic stress disorder (PTSD) are common among individuals with serious mental illness (SMI; e.g., schizophrenia, schizoaffective disorder, bipolar disorder, treatment refractory major depressive disorder), with resultant functional impairment. Previous studies have not evaluated the factor structure of the PTSD Checklist (PCL) among persons with SMI. AIMS: This study evaluated the factor structure of the PCL in two large SMI samples from public mental health treatment sectors screened for PTSD using the PCL. METHODS: Four different models of PTSD were tested using confirmatory factor analyses. RESULTS: Results indicated that the DSM-5 4-factor model (intrusion, avoidance, numbing, and hyperarousal) had the best fit. Further, the DSM-5 4-factor model demonstrated measurement invariance. CONCLUSIONS: Results supported the suitability of the DSM-5 4-factor model of PTSD among people with SMI.

Dimensionality of the Swahili version of the General Health Questionnaire (GHQ-12) in a Kenyan population: A confirmatory factor analysis.

The current study evaluated the Kiswahili version of General Health Questionnaire (GHQ-12) in a Kenyan context comprising of women exposed to gender-based violence. Participants were randomly drawn from community sampling using household screening methods in peri-urban areas in Nairobi. A total of 1,394 participants with varying levels of literacy (years of education: mean [M] = 9.42; standard deviation [SD] = 3.73) and aged between 18 and 89 years were recruited for the study. The observed factor structure of the GHQ-12 was evaluated using six most tested models querying the dimensionality of the instrument insofar as the impacts of positive and negative wording effects in driving multidimensionality. Results from the confirmatory factor analysis supported a bifactor model, consisting of a general distress factor and two separate factors representing common variance due to the positive and negative wording of items. Overall, the findings support the use of the Kiswahili version of the GHQ-12 as a unidimensional construct with method-specific variance owing to wording effects. Importantly, GHQ-12 responses from a sample of Kenyan women with relatively low levels of literacy are congruent with the factor structure observed in other cross-cultural settings in low- and-middle-income countries.

Psychometric properties of the Spanish version of the functionality appreciation scale.

BACKGROUND: The Functionality Appreciation Scale is a 7-item measure of an individual's appreciation of his or her body for what it can do and is capable of doing. While this instrument has been increasingly used in intervention-based research, its psychometric properties have not been extensively studied in non-English-speaking populations. The psychometric properties of a novel Spanish translation of the FAS were examined. METHODS: An online sample of 838 Spanish adults (mean age = 31.79 ± 11.95 years, 50.48% men) completed the Spanish FAS and validated measures of body appreciation, eating disorder symptomatology, intuitive eating, and life satisfaction. RESULTS: Exploratory factor analysis supported a 1-dimensional factor structure of the FAS, which was further supported by confirmatory factor analysis (SBχ²(14) = 83.82, SBχ²normed = 1.48, robust RMSEA = 0.094 (90% CI = 0.074, 0.115), SRMR = 0.040, robust CFI = 0.946, robust TLI = 0.924). Invariance across genders was shown, and there were no significant differences according to gender (t(417) = 0.77, p =.444, d = 0.07). Construct validity was also supported through significant associations with the other measures of the study. Incremental validity was established in women. Thus, appreciation of functionality predicted life satisfaction over and above the variance accounted for by other body image and eating disorder-related measures (F(4, 399) = 18.86, p <.001, ΔR2 = 0.03). CONCLUSIONS: These results support the psychometric properties of the Spanish FAS and demonstrate the importance of the appreciation of functionality in relation to a healthier body image and psychological wellbeing.

Factor structure and psychometric properties of the Jordanian version of the depression anxiety stress scale (DASS-21).

AIM: Early diagnosis of health conditions such as depression, anxiety, and stress, which have been recognized as global health issues, is essential for providing psychological support to people who experience negative emotions. Therefore, it is important to identify a reliable method for diagnosing depression, anxiety, and stress. To this end, this study investigated the factor structure and evaluated the psychometric properties of the Depression Anxiety Stress Scale-21 (DASS-21) in Jordan. METHODS: A university sample of 336 Jordanians completed the Arabic version of the DASS-21 and several psychopathology measures. Cross-sectional study and confirmatory factor analysis (CFA) were applied to achieve the study's aims. RESULTS: CFA favored the bifactor model compared to the other four models. In contrast, the Beck Anxiety Inventory (BAI) and the Beck Depression Inventory-II (BDI-II) strongly correlated with the DASS-21, indicating that the DASS-21 has adequate convergent and divergent validity. Subsequently, the scale's discriminant validity was tested using the heterotrait-monotrait (HTMT) correlation ratio, which was found to be relatively insufficient. While DASS-21 showed strong reliability, Cronbach's α and McDonald's omega values ranged between 0.83 and 0.93. CONCLUSION: The bifactor model best fits the Jordanian sample data. The DASS-21 has optimum psychometric properties; therefore, it can be used to assess the general distress experienced by the Jordanian community during research investigations and in non-clinical settings.

A Chinese adaptation of the Patient Health Questionnaire for Adolescents (PHQ-A): factor structure and psychometric properties.

BACKGROUND: To examine the factor structure and psychometric properties of the Patient Health Questionnaire for Adolescents (PHQ-A) in Chinese children and adolescents with major depressive disorder (MDD). METHODS: A total of 248 MDD patients aged between 12 and 18 years were recruited and evaluated by the Patient Health Questionnaire for Adolescents (PHQ-A), the Center for Epidemiological Survey Depression Scale (CES-D), the Mood and Feelings Questionnaire (MFQ), and the improved Clinical Global Impression Scale, Severity item (iCGI-S). Thirty-one patients were selected randomly to complete the PHQ-A again one week later. Confirmatory factor analysis (CFA) was used to test the construct validity of the scale. Reliability was evaluated by Macdonald Omega coefficient. Pearson correlation coefficient was used to assess the item-total correlation and the correlation of PHQ-A with CES-D and MFQ respectively. Spearman correlation coefficient was used to assess test-retest reliability. The optimal cut-off value, sensitivity, and specificity of the PHQ-A were achieved by estimating the Receiver Operating Characteristics (ROC) curve. RESULTS: CFA reported adequate loadings for all items, except for item 3. Macdonald Omega coefficient of the PHQ-A was 0.87. The Spearman correlation coefficient of the test-retest reliability was 0.70. The Pearson correlation coefficients of the PHQ-A with CES-D and MFQ were 0.87 and 0.85, respectively (p < 0.01). By taking the iCGI-S as the remission criteria for MDD, the optimal cut-off value, sensitivity and specificity of the PHQ-A were 7, 98.7%, 94.7% respectively. CONCLUSION: The PHQ-A presented as a unidimensional construct and demonstrated satisfactory reliability and validity among the Chinese children and adolescents with MDD. A cut-off value of 7 was suggested for remission.

Deriving the Transdiagnostic Scales From the Personality Assessment Inventory and SPECTRA: Indices of Psychopathology: A Demonstration.

Transdiagnostic models of psychopathology address many of the shortcomings common to categorical diagnostic systems. These empirically derived models conceptualize psychopathology as a few broad interrelated and hierarchically arranged dimensions, with an overarching general psychopathology dimension, the p-factor, at the apex. While transdiagnostic models are gaining prominence in mental health research, the lack of available tools has limited their clinical translation. The present study explored the potential of creating transdiagnostic scales from the joint factor structure of the Personality Assessment Inventory, Alternative Model of Personality Disorder trait scales (AMPD), and the clinical scales of the SPECTRA: Indices of Psychopathology (SPECTRA). Exploratory factor analysis in a clinical sample (n = 212) identified five factors corresponding to the Negative Affect/Internalizing, Detachment, Antagonism/Externalizing, Disinhibition/Externalizing, and Thought Disorder transdiagnostic dimensions. Goldberg's "Bass-Ackward" method supported a hierarchical structure. Five composite transdiagnostic scales were created by summing each factor's highest loading PAI and SPECTRA scales. A global psychopathology scale was created by summing the five composite scales. All the composite scales demonstrated adequate internal consistency. Correlations between the composite scales and the NEO Five-Factor Inventory-3 provide initial validity evidence for four composite and global scales. The composite thought disorder scale had no conceptually corresponding NEO domain. Clinical implications and study limitations are discussed.

Academic grit scale for Chinese middle- and upper-grade primary school students: testing its factor structure and measurement invariance.

The Academic Grit Scale (AGS) is a novel measure of academic-specific grit. However, its factor structure and measurement invariance have yet to be thoroughly supported. The present study tested the factor structure and measurement invariance of the AGS with a large sample of early adolescents (aged 9-14 years) from China (N = 1,894). The bifactor model showed that the AGS was predominately accounted for by the general factor rather than the domain-specific factors; the parallel model from the AGS's one-factor model showed good fit indices; thus, the AGS should be described as a univocal solution and reported as the total score. Gender and grade measurement invariance were supported at a scalar level, warranting further mean difference comparisons. In addition, academic grit was significantly associated with positive academic emotions and academic achievement, yielding evidence of good criteria-related validity. The current study contributes additional evidence to the construct validity of the Chinese version of the AGS among middle- and upper-grade primary school students in China.

Psychometric properties of the Teenage Executive Functioning Inventory (TEXI): A confirmatory factor analysis and measurement invariance by gender in Bangladeshi adolescents.

The Teenage Executive Functioning Inventory (TEXI) is a newly developed, reliable, and valid measure to assess deficits in executive functioning. The present study aimed to adapt and evaluate the psychometric properties and factor structure of the Bangla version of the TEXI in a sample of Bangladeshi adolescents. The cross-sectional research on 360 Bangladeshi adolescents aged between 12 and 18 years was carried out. Initially, the 20-item TEXI was translated into Bangla and pretested. Confirmatory factor analysis (CFA) was used to test factor structure and measurement invariance across genders. The CFA identified a two-factor solution, including working memory and inhibition, thereby replicating the original model. Multi-group CFA further suggested configural, metric, scaler, and residual measurement invariance between genders in a Bangladeshi sample. The internal consistency reliability of the TEXI was adequate. Construct and criterion-related validity were confirmed by establishing substantial and statistically significant correlations between the two factors within the TEXI and the associations between academic performance and the overall TEXI score. The Bangla version of the TEXI is a valuable measurement tool for evaluating executive dysfunction among adolescents. This study opens the door to future research on adolescents' executive functioning deficits and their relationship with other real-life behaviors.

Validation of intercultural competence scale in the Ethiopian context: Exploring the factor structure and psychometric properties among university students.

BACKGROUND: Although intercultural competence is a crucial factor for university students' academic achievement and inter-ethnic conflict resolution, psychometrically sound intercultural competence scale is not available in the Ethiopian context. The aim of the present study was to translate the original English version of intercultural competence into Amharic language and validate the scale in the Ethiopian context. MATERIALS AND METHODS: In the processes of retaining culturally equivalent translated measure symmetrical approach was used. Data were collected from 476 (Male = 244 and Female = 232) arbitrarily selected university students with an age mean of 22.35 enrolled in undergraduate degree programs at Ambo University. The total sample was randomly split into two equal-sized group to execute exploratory factor analysis (EFA, N = 238) and confirmatory factor analysis (CFA, N = 238). RESULT: The result of the study showed that both EFA and CFA supported a significantly correlated four-factor model of intercultural competence (Attitude, Awareness, Knowledge, and Skills). Moreover, the Amharic version of the intercultural competence scale showed good psychometric properties in terms of content validity, construct validity, internal consistency, and good fit indices to the data. CONCLUSION: This generally justifies the use of the Amharic version intercultural competence scale in the Ethiopian context. To satisfy the needs of the labor market, universities in Ethiopia should promote intercultural dialogues that improve the intercultural competence of university students.

Internal state language factor structure and development in toddlerhood: Insights from WordBank.

Internal state language (ISL) research contains knowledge gaps, including dimensionality and predictors of growth, addressed here in a two-aim study. Parent-reported expressive language from N = 6,373 monolingual, English-speaking toddlers (Mage = 23.5mos, 46% male, 57% white) was collected using cross-sectional and longitudinal data in WordBank. Exploratory and confirmatory factor analyses suggested a best-fitting one-factor model of ISL. The single-factor model of ISL was then submitted to hierarchical linear modeling to evaluate predictors of ISL development. Age 2 ISL production was predicted by child sex, wherein females outperform males, and maternal education, wherein higher education contributes to higher ISL. Only maternal education emerged as a significant predictor of ISL growth. These results provide support to theory suggesting a unitary construct of ISL, as opposed to considering ISL as categorical, and further illustrate linear growth through the second postnatal year that varies as a function of child sex and maternal education.

Assessment of psychometric properties and measurement invariance of the sensation seeking scale for children in a Norwegian sample.

Introduction: The aim of this study was to examine the psychometric properties of a Norwegian translation of the Sensation Seeking Scale for Children (SSSC), designed for children between 7 and 12 years of age. Methods: A sample of 393 children (7-10 years old) were recruited to participate in the study. The SSSC was administered through interviews with each child, wherein their responses to the SSSC questionnaire were recorded on a tablet. Results: Analysis of internal consistency reliability did not show acceptable reliability for all subscales, and confirmatory factor analysis (CFA) showed that the Thrill Seeking and Behavioral Intensity subscales were associated and somewhat overlapping, while Behavioral Inhibition appeared as a single factor. A further explanatory factor analysis (EFA) revealed a two-factor solution. CFA of the two-factor solution resulted in the removal of some items in both factors due to low factor loadings. The final factors resulting from this analysis were Thrill and Intensity Seeking (13 items) and Behavioral Inhibition (7 items). The results also show that boys scored higher than girls on Thrill and Intensity Seeking while girls scored higher than boys on Behavioral Inhibition. Furthermore, age was positively associated with both subscales, meaning that older children tended to score higher. Discussion: The results in this study suggest that measures of children's sensation seeking might be sensitive to cultural contexts and that, at least in a Norwegian population, a two-factor solution of the SSSC is recommended.

Factor structure and longitudinal invariance for the Chinese Mainland version of the Edinburgh postnatal depression scale during pregnancy.

BACKGROUND: There are inconsistent results on the Edinburgh Postnatal Depression Scale's (EPDS) factor structure and longitudinal invariance among different cultures. Furthermore, limited relevant studies in Chinese pregnant women exist. PURPOSE: To test the factor structure of the Chinese Mainland EPDS during pregnancy and conduct longitudinal invariance analyses. METHODS: A national multi-centre cohort study was conducted among 1207 pregnant women selected consecutively by convenience sampling from five hospitals in Zhuhai, Taiyuan, Haidian, Changchun, and Shenzhen in China between August 2015 and October 2016. Depression was measured by the EPDS during gestational weeks 10-13, 15-18, 23-25, 30-32 and 36-37, respectively.s RESULTS: Three factors with eigenvalues nearly larger than 1.0 were optimal for the Chinese Mainland EPDS, labelled "anxiety," "anhedonia," and "depression," and contained items 3-5, 1-2, and 6-10, respectively. The confirmatory factor analysis results of standardized root mean square residual (SRMR) = 0.034, root mean square error of approximation (RMSEA) = 0.049, comparative fit index (CFI) = 0.968, Tucker-Lewis index (TLI) = 0.954, and χ2, p < 0.05 indicated good fit. For the longitudinal invariance tests, the configural invariance was met, with the CFI and TLI both higher than 0.90 and the RMSEA lower than 0.08 (CFI = 0.919, TLI = 0.908, and RMSEA = 0.034). The metric-, scalar-, and strict invariances were met. CONCLUSIONS: The three-factor model of the Chinese Mainland EPDS is invariant in pregnancy, suggesting stability and comparability in identifying the women screened positive at different points during pregnancy and making the scale feasible to screen prenatal depression and anxiety simultaneously.

Parental mental health and reporting of their child's behaviour: measurement invariance of the French version of the parental strengths and difficulties questionnaire.

Symptomatic effects of mental disorders in parents could bias their reporting on their child's mental health. This study aimed to investigate the measurement invariance of the French version of the parental Strengths and Difficulties Questionnaire (SDQ) across parental mental health in a sample (N = 20,765) of parents of children aged 3 to 17 years in France. Confirmatory factor analysis (CFA) and Exploratory Structural Equation Modelling (ESEM) were used to evaluate the fit of three known alternative SDQ factor structures (five, three, or second-order factor structures). Invariance was tested across parental mental health (present anxiety and depressive symptoms, psychiatric history) and across socio-demographic characteristics (child's age, child's gender, parent's gender, parent's educational level). CFA models showed a poor fit, while all ESEM models achieved acceptable or good fit, with the five-factor model presenting the best fit. Invariance was observed for all characteristics tested, indicating that the SDQ can be used to study the links between parental mental health and their child's mental health without bias. However, ESEM showed that the hyperactivity/inattention and conduct problems dimensions were not well differentiated in the French version of the SDQ.

An Automated Online Measure for Misophonia: The Sussex Misophonia Scale for Adults.

Misophonia is a sound sensitivity disorder characterized by a strong aversion to specific sounds (e.g., chewing). Here we present the Sussex Misophonia Scale for Adults (SMS-Adult), within an online open-access portal, with automated scoring and results that can be shared ethically with users and professionals. Receiver operator characteristics show our questionnaire to be "excellent" and "good-to-excellent" at classifying misophonia, both when dividing our n = 501 adult participants by recruitment stream (self-declared misophonics vs. general population), and again when dividing them with by a prior measure of misophonia (as misophonics vs. non-misophonics). Factor analyses identified a five-factor structure in our 39 Likert-type items, and these were Feelings/Isolation, Life consequences, Intersocial reactivity, Avoidance/Repulsion, and Pain. Our measure also elicits misophonia triggers, each rated for their commonness in misophonia. We offer our open-access online tool for wider use (www.misophonia-hub.org), embedded within a well-stocked library of resources for misophonics, researchers, and clinicians.

Factor structure of the alcohol expectancies questionnaire among adolescents in rural Ghana.

INTRODUCTION: Children's early experiences with alcohol inform the development of alcohol-related beliefs which are known to predict alcohol consumption during the critical stage of adolescence. Yet, there has been considerably less research into these alcohol-related cognitions in low- and middle-income countries (LMIC) and existing measures of these beliefs are highly reflective of Western contexts, which may not be fully appropriate for use in LMICs. The aim is to ascertain the construct validity of the Alcohol Expectancies Questionnaire (AEQ) in a non-Western sample. METHODS: A cross-sectional diagnostic accuracy study involving 500 adolescents aged 10 to 18 years randomly selected from the database of the Navrongo Health and Demographic Surveillance System. Participants were administered the locally back translated version of the 34-item AEQ. Confirmatory factor analysis using the lavaan package in R was conducted to generate indices for the factor structure of the AEQ. RESULTS: Confirmatory factor analyses showed that while groupings of positive and negative expectancies were similar to those observed when expectancies have been assessed previously in Western studies, these formed a single 'alcohol expectancy' factor. Questions relating to positive tension reduction and negative physical expectancies showed inconsistent responses in this study. DISCUSSION AND CONCLUSIONS: Commonly used tools for the assessment of alcohol expectancies may not be suitable for use in Ghana, possibly owing to their development and validation in Western contexts. These findings have implications for the assessment of alcohol-related beliefs in LMIC settings and begin to map out a research agenda to develop more contextually and culturally attune alcohol assessments.

The Factorial Structure, Psychometric Properties and Sensitivity to Change of the Distress Tolerance Scale for Children with Emotional Disorders.

BACKGROUND: The Distress Tolerance Scale (DTS) was adapted for American and Chinese youth, but never for European youth. Moreover, the factor structures found in these previous studies were not consistent. METHODS: The DTS was adapted for Portuguese children and then validated among 153 children aged 6-13 years with emotional disorders. A confirmatory factor analysis (CFA) was conducted; the DTS reliability and validity were analyzed, and sex and age differences were explored. A sub-sample of children who received a transdiagnostic CBT (Unified Protocol for Children) was used to analyze the DTS's sensitivity to therapeutic change. RESULTS: The five tested models (based on previous studies) exhibited adequate fit in the CFA. However, the model previously reported for use in American children with emotional disorders was selected as the most appropriate. The DTS demonstrated adequate psychometric properties, and its validity was established through significant negative associations with measures of anxiety, depression and negative affect, as well as positive associations with positive affect. Age and sex differences were discussed. The DTS scores significantly increased from pre- to post-treatment, demonstrating sensitivity to therapeutic change. CONCLUSIONS: The DTS is a suitable and useful measure for assessing children's distress tolerance and to assess the efficacy of CBT.

Cross-cultural adaptation and clinical application of the Perth Empathy Scale.

OBJECTIVE: Alterations of empathy have been observed in patients with various mental disorders. The Perth Empathy Scale (PES) was recently developed to measure a multidimensional construct of empathy across positive and negative emotions. However, its psychometric properties and clinical applications have not been examined in the Chinese context. METHODS: The Chinese version of the PES was developed and administered to a large Chinese sample (n = 1090). Factor structure, internal consistency, test-retest reliability, and convergent, discriminant, as well as concurrent validity were examined. Moreover, 50 patients with major depressive disorder (MDD) and 50 healthy controls were recruited to explore the clinical utility of the PES. RESULTS: Confirmatory factor analyses supported a theoretically congruent three-factor structure of empathy, namely Cognitive Empathy, Negative Affective Empathy and Positive Affective Empathy. The PES showed good to excellent internal consistency reliability, good convergent and discriminant validity, acceptable concurrent validity, and moderate to high test-retest reliability. Patients with MDD had significantly lower PES scores compared to healthy controls. Linear discriminant function comprised of the three factors correctly differentiated 71% of participants, which further verified the clinical utility of the PES. CONCLUSIONS: Our findings indicated that the Chinese version of the PES is a reliable and valid instrument to measure cognitive and affective empathy across negative and positive emotions, and could therefore be used in both research and clinical practice.

Illustrating psychometric tests, scales, and constructs: An R package for Item Pool Visualization.

Researchers assessing psychological constructs have to understand and choose between several competing measures. Item Pool Visualization (IPV, Dantlgraber et al., 2019) was developed to offer a systematic and detailed portrayal of the actual content and internal balance of competing measures. To enable the use of IPV, we developed and present here the IPV R package. Its aim is to allow researchers to add IPV to their repertoire with minimal effort. Creating IPV charts from raw data requires two simple function calls, because the package streamlines model specification, model estimation, and chart creation. It improves IPV conceptually by introducing the aggregate center distance and the item overview chart. It provides many customization options and generates high-quality, vector-based PDF output. The workflow of the package is explained using a reproducible open data example from a personality assessment.