unmarked (version 0.8-5)

modSel: Model selection results from an unmarkedFitList

Description

Model selection results from an unmarkedFitList

Arguments

object

an object of class "unmarkedFitList" created by the function fitList.

nullmod

optional character naming which model in the fitList contains results from the null model. Only used in calculation of Nagelkerke's R-squared index.

Value

• 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.

References

Nagelkerke, N.J.D. (2004) A Note on a General Definition of the Coefficient of Determination. Biometrika 78, pp. 691-692.

Examples

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="Null"))

ms@Estimates
ms@SE
ms@Full