profLlgm: Joint confidence regions

In geostatsp: Geostatistical Modelling with Likelihood and Bayes

Joint confidence regions

Description

Calculates profile likelihoods and approximate joint confidence regions for covariance parameters in linear geostatistical models.

Usage

profLlgm(fit, mc.cores = 1, ...)
informationLgm(fit,  ...)

Arguments

fit	Output from the lgm function
mc.cores	Passed to mclapply
...	For profLlgm, one or more vectors of parameter values at which the profile likelihood will be calculated, with names corresponding to elements of fit$param. For informationLgm, arguments passed to hessian

Value

one or more vectors	of parameter values
logL	A vector, matrix, or multi-dimensional array of profile likelihood values for every combination of parameter values supplied.
full	Data frame with profile likelihood values and estimates of model parameters
prob, breaks	vector of probabilities and chi-squared derived likelihood values associated with those probabilities
MLE, maxLogL	Maximum Likelihood Estimates of parameters and log likelihood evaluated at these values
basepars	combination of starting values for parameters re-estimated for each profile likelihood and values of parameters which are fixed.
col	vector of colours with one element fewer than the number of probabilities
ci, ciLong	when only one parameter is varying, a matrix of confidence intervals (in both wide and long format) is returned.

Author(s)

Patrick Brown

See Also

lgm, mcmapply, hessian

Examples

# this example is time consuming
# the following 'if' statement ensures the CRAN
# computer doesn't run it
if(interactive() | Sys.info()['user'] =='patrick') {

library('geostatsp')
data('swissRain')
swissRain = unwrap(swissRain)
swissAltitude = unwrap(swissAltitude)

swissFit = lgm(data=swissRain, formula=rain~ CHE_alt,
		grid=10, covariates=swissAltitude,
		shape=1,  fixShape=TRUE, 
		boxcox=0.5, fixBoxcox=TRUE, 
		aniso=TRUE,reml=TRUE,
		param=c(anisoAngleDegrees=37,anisoRatio=7.5,
		range=50000))


x=profLlgm(swissFit,
		anisoAngleDegrees=seq(30, 43 , len=4)
)


plot(x[[1]],x[[2]], xlab=names(x)[1],
		ylab='log L',
		ylim=c(min(x[[2]]),x$maxLogL),
		type='n')
abline(h=x$breaks[-1],
		col=x$col,
		lwd=1.5)
axis(2,at=x$breaks,labels=x$prob,line=-1.2,
	tick=FALSE,
		las=1,padj=1.2,hadj=0)
abline(v=x$ciLong$par,
		lty=2,
		col=x$col[as.character(x$ciLong$prob)])
lines(x[[1]],x[[2]], col='black')



}

geostatsp documentation built on March 19, 2024, 3:08 a.m.