R: constructor of unmarkedFitList objects

fitList {unmarked} | R Documentation

## constructor of unmarkedFitList objects

### Description

Organize models for model selection or model-averaged prediction.

### Usage

    fitList(..., fits)

### Arguments

`...` | Fitted models. Preferrably named.
`fits` | An alternative way of providing the models. A (preferrably named) list of fitted models.

### Note

Two requirements exist to conduct AIC-based model-selection and model-averaging in unmarked. First, the data objects (ie, unmarkedFrames) must be identical among fitted models. Second, the response matrix must be identical among fitted models after missing values have been removed. This means that if a response value was removed in one model due to missingness, it needs to be removed from all models.

### Author(s)

Richard Chandler rbchan@uga.edu

### 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)

    ## Two methods of creating an unmarkedFitList using fitList()

    # Method 1
    fmList <- fitList(Null=fm1, .area=fm2, area.=fm3)

    # Method 2. Note that the arugment name "fits" must be included in call.
    models <- list(Null=fm1, .area=fm2, area.=fm3)
    fmList <- fitList(fits = models)

    # Extract coefficients and standard errors
    coef(fmList)
    SE(fmList)

    # Model-averaged prediction
    predict(fmList, type="state")

    # Model selection
    modSel(fmList, nullmod="Null")

[Package unmarked version 1.0.0 Index]