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In SightabilityModel: Wildlife Sightability Modeling

covtheta

R Documentation

Estimates var/cov matrix of inflation factors (1/prob detection) using a non-parametric bootstrap.

Estimates var/cov matrix of inflation factors (1/prob detection) using a non-parametric bootstrap. Called by function Sight.Est if Vm.boot = TRUE.

covtheta(total, srates, stratum, subunit, covars, betas, varbetas, nboots)

`total`	Number of animals in each independently sighted group
`srates`	Plot sampling probability (associated with the independently observed animal groups)
`stratum`	Stratum identifiers (associated with the independently observed animal groups)
`subunit`	Plot ID (associated with the independently observed animal groups)
`covars`	Matrix of sightability covariates (associated with the independently observed animal groups)
`betas`	Logistic regression parameter estimates (from fitted sightability model)
`varbetas`	Estimated variance-covariance matrix for the logistic regression parameter estimates (from fitted sightability model)
`nboots`	Number of bootstrap resamples.

smat

Estimated variance-covariance matrix for the inflation factors theta = (1/probability of detection). This is an n.animal x n.animal matrix.

John Fieberg