1.
Ecology
; 93(11): 2497-8, 2012 Nov.
Artigo
em Inglês
| MEDLINE
| ID: mdl-23236921
2.
Am Nat
; 170(4): 651-4; discussion 655-9, 2007 Oct.
Artigo
em Inglês
| MEDLINE
| ID: mdl-17891743
RESUMO
An important problem is to infer the abundance of a species in an area from its presence or absence in the cells of a uniform grid. If the abundance is assumed to be distributed over cells according to a negative binomial model, a value of the clustering parameter k is needed to infer the abundance. It is shown that, despite a proposal in the literature, k cannot be estimated from presence-absence data but must be given from outside information.