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#' poissonfitsbetter.R
#'
#' poisson.fits.better()
#' and underlying calculations
#'
#' $Revision: 1.1 $ $Date: 2022/11/10 06:51:16 $
#'
#' Copyright (c) Adrian Baddeley 2022
#' GNU Public Licence >= 2.0
poisson.fits.better <- function(object) {
if(!is.null(ispo <- object$ispo)) return(isTRUE(ispo))
y <- PoissonCompareCalc(object)
if(is.null(y)) return(FALSE)
answer <- with(y, if(maximising) (poisval >= optval) else (poisval <= optval))
return(answer)
}
PoissonCompareCalc <- function(object) {
stopifnot(is.kppm(object))
if(!isTRUE(object$isPCP)) return(NULL)
Fit <- object$Fit
switch(Fit$method,
mincon = {
m <- Fit$mcfit
canonical <- !is.null(m$par.canon)
optpar <- if(canonical) m$par.canon else m$par
objfun <- m$objfun
objargs <- m$objargs
maximising <- FALSE
},
palm = ,
clik2 = {
canonical <- !is.null(object$par.canon)
optpar <- if(canonical) object$par.canon else object$par
objfun <- Fit$objfun
objargs <- Fit$objargs
maximising <- TRUE
},
return(NULL)
)
## optimised value
optval <- objfun(optpar, objargs=objargs)
## value for Poisson
poispar <- optpar
if(canonical) {
if(is.na(match("strength", names(optpar))))
stop("Internal error: the canonical parameters do not include 'strength'")
poispar[["strength"]] <- 0
} else {
if(is.na(match("kappa", names(optpar))))
stop("Internal error: the parameters do not include 'kappa'")
poispar[["kappa"]] <- Inf
}
poisval <- objfun(poispar, objargs=objargs)
return(list(optval=optval, poisval=poisval, maximising=maximising))
}
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