modSel {unmarked} | R Documentation |
Model selection results from an unmarkedFitList
object |
an object of class "unmarkedFitList" created by the function
fitList |
nullmod |
optional object storing results of null model. Only used in calculation of Nagelkerke's R-squared index |
A S4 object with the following slots
Estimates |
Matrix containing parameter estimates for each model |
SE |
Matrix containing standard errors for model parameters |
Full |
data.frame with formula, estimates, standard errors and model selection information. Converge is optim convergence code. CondNum is model condition number. Rsq is Nagelkerke's (1991) R-squared index, which is only returned when the nullmod argument is specified. |
Nagelkerke, N.J.D. (2004) A Note on a General Definition of the Coefficient of Determination. Biometrika 78, pp. 691-692.
data(linetran) (dbreaksLine <- c(0, 5, 10, 15, 20)) lengths <- linetran$Length * 1000 ltUMF <- with(linetran, { unmarkedFrameDS(y = cbind(dc1, dc2, dc3, dc4), siteCovs = data.frame(Length, area, habitat), dist.breaks = dbreaksLine, tlength = lengths, survey = "line", unitsIn = "m") }) fm1 <- distsamp(~ 1 ~1, ltUMF) fm2 <- distsamp(~ area ~1, ltUMF) fm3 <- distsamp( ~ 1 ~area, ltUMF) fl <- fitList(Null=fm1, A.=fm2, .A=fm2) fl (ms <- modSel(fl, nullmod=fm1)) ms@Estimates ms@SE ms@Full