Usos del coeficiente alfa de Cronbach en el análisis de instrumentos escritos / The usage of the Cronbach Coefficient alpha in the Analysis of the Written Instruments
Rev. medica electron
; 34(1): 1-6, ene.-feb. 2012.
Article
in Es
| LILACS
| ID: lil-629890
Responsible library:
CU424.1
RESUMEN
Se realizó un estudio de carácter evaluativo para determinar la precisión de un examen escrito mediante un análisis de fiabilidad. El examen, integrado por 30 preguntas que exploran cierto tipo de conocimiento profesional, se aplicó a 45 personas, y con los puntajes obtenidos se creó una base de datos en SPSS para Windows, versión 16. Se calculó el coeficiente alfa de Cronbach, para diferentes partes del examen y coeficientes de discriminación para determinar las variables más relevantes a los efectos de la confiabilidad del examen. Los resultados principales se presentaron en tablas. Se obtuvo un valor negativo para la confiabilidad del examen, y mediante eliminación de preguntas y cambio de escala de los puntajes, se obtuvo un examen de confiabilidad aceptable. Se concluyó que el análisis de fiabilidad es un procedimiento efectivo para incrementar la precisión de un examen
ABSTRACT
It was performed a study, to evaluate the precision of a written test by means of a reliability analysis. The test, with 30 questions exploring some kind of professional knowledge, was applied to a set of 45 persons. Using the SPSS for Windows Version 16 software, a data base was created with the scores obtained. We calculated the Cronbach alpha coefficients for different parts of the test and the corresponding indexes of discrimination in order to determine the most relevant variables related with the reliability of the test. The principal findings were presented in statistical tables. A negative value of the reliability coefficient was obtained for the initial test, but, by means of putting out some questions and making appropriate changes in the score scales of them, a new version of the test with a medium level of reliability was obtained. It was concluded that the reliability analysis is an effective tool to increase the precision of a test
Key words
Full text:
1
Collection:
01-internacional
Database:
LILACS
Main subject:
Statistics as Topic
/
Data Interpretation, Statistical
Limits:
Humans
Language:
Es
Journal:
Rev. medica electron
Journal subject:
MEDICINA
Year:
2012
Document type:
Article
Affiliation country:
Cuba