computeMPLElambda {unmarked}

Compute the penalty weight for the MPLE penalized likelihood method

Description

This function computes the weight for the MPLE penalty of Moreno & Lele (2010).

Usage

computeMPLElambda(formula, data, knownOcc=numeric(0), starts,
method="BFGS",engine=c("C", "R"))

Arguments

formula

Double right-hand side formula describing covariates of detection and occupancy in that order.

data

An unmarkedFrameOccu object

knownOcc

Vector of sites that are known to be occupied. These should be supplied as row numbers of the y matrix, eg, c(3,8) if sites 3 and 8 were known to be occupied a priori.

starts

Vector of parameter starting values.

method

Optimization method used by optim.

engine

Either "C" or "R" to use fast C++ code or native R code during the optimization.

Details

See occuPEN for details and examples.

Value

The computed lambda.

Author(s)

Rebecca A. Hutchinson

References

Moreno, M. and S. R. Lele. 2010. Improved estimation of site occupancy using penalized likelihood. Ecology 91: 341-346.

See Also

unmarked, unmarkedFrameOccu, occu, occuPEN, occuPEN_CV, nonparboot