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dpearsonIII <- function(x,shape,location,scale,params,log=FALSE) {
if (!missing(params)) { shape <- params[[1]];
location <- params[[2]]; scale <- params[[3]] }
# stopifnot((shape>0)&&(scale!=0))
gscale <- abs(scale); ssgn <- sign(scale)
dgamma(ssgn*(x-location),shape=shape,scale=gscale,log=log)
}
ppearsonIII <- function(q,shape,location,scale,params,lower.tail=TRUE,
log.p=FALSE) {
if (!missing(params)) { shape <- params[[1]];
location <- params[[2]]; scale <- params[[3]] }
# stopifnot((shape>0)&&(scale!=0))
gscale <- abs(scale); ssgn <- sign(scale)
pgamma(ssgn*(q-location),shape=shape,scale=gscale,
lower.tail=xor(scale<0,lower.tail),log.p=log.p)
}
qpearsonIII <- function(p,shape,location,scale,params,lower.tail=TRUE,
log.p=FALSE) {
if (!missing(params)) { shape <- params[[1]];
location <- params[[2]]; scale <- params[[3]] }
# stopifnot((shape>0)&&(scale!=0))
gscale <- abs(scale); ssgn <- sign(scale)
ssgn*qgamma(p,shape=shape,scale=gscale,
lower.tail=xor(scale<0,lower.tail),log.p=log.p)+location
}
rpearsonIII <- function(n,shape,location,scale,params) {
if (!missing(params)) { shape <- params[[1]];
location <- params[[2]]; scale <- params[[3]] }
# stopifnot((shape>0)&&(scale!=0))
gscale <- abs(scale); ssgn <- sign(scale)
ssgn*rgamma(n,shape=shape,scale=gscale)+location
}
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