Gamma.start.limits: Gamma.start.limits - Start and limit values for Gamma...

In Rdistance: Distance-Sampling Analyses for Density and Abundance Estimation

Gamma.start.limits - Start and limit values for Gamma parameters.

Description

Compute starting values and limits for the Gamma likelihood function.

Usage

Gamma.start.limits(dist, covars, expansions, w.lo, w.hi)

Arguments

dist	A numeric vector containing observed distances with measurement units.
covars	Data frame containing values of covariates at each observation in dist.
expansions	A scalar specifying the number of terms in series. Depending on the series, this could be 0 through 5. The default of 0 equates to no expansion terms of any type.
w.lo	Scalar value of the lowest observable distance, with measurement units. This is the left truncation sighting distance. Values less than w.lo are allowed in dist, but are ignored and their likelihood value is set to NA in the output.
w.hi	Scalar value of the largest observable distance, with measurement units. This is the right truncation sighting distance. Values greater than w.hi are allowed in dist, but are ignored and their likelihood value is set to NA in the output.

Value

A list containing the following components:

• start : a vector of starting values

• lowlimit : a vector of lower limits (can be -Inf)

• highlimit : a vector of upper limits (can be Inf)

• nms : a vector containing names of the parameters

Rdistance documentation built on July 9, 2023, 6:46 p.m.