mkde (version 0.4)

estVarMKDE: Estimate move variances for 3D MKDE.

Description

Estimates the move variance for the (x, y) and z dimensions and altitude for a Brownian bridge MKDE.

Usage

estVarMKDE(move.dat)

Value

A move data object updated with move variances

Arguments

move.dat

A move data object created with initializeMovementData

Author

Jeff A. Tracey, PhD
USGS Western Ecological Research Center, San Diego Field Station

James Sheppard, PhD
San Diego Zoo Institute for Conservation Research

Details

Computes maximum-likelihood estimates for move variances. If the MKDE is 2D or 2.5D, only the variance for the xy-dimension is estimated. If the MKDE is 3D, a separate move variance for the z-dimension is also estimated.

Examples

data(condor)
mv.dat <- initializeMovementData(condor$time, condor$x, condor$y, 
z.obs=condor$z, sig2obs=25.0, sig2obs.z=81.0, t.max=65.0)

mv.dat <- estVarMKDE(mv.dat)
cat(paste("Move variance in xy-dimensions = ",
mv.dat$sig2xy[1], "\n", sep=""))
cat(paste("Move variance in z-dimension = ",
mv.dat$sig2z[1], "\n", sep=""))