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#' \name{AIC.ssym}
#' \alias{AIC.ssym}
#' \title{AIC.ssym}
#' \description{
#' \bold{AIC.ssym} calculates the goodness-of-fit statistic AIC from an object of class ``"ssym".}
#'
AIC.ssym <-
function(object, ...){
gle <- sum(object$gle.mu) + sum(object$gle.phi)
AIC <- round(-2*sum(object$lpdf) + 2*(gle), digits=3)
y <- object$z_es*sqrt(object$phi.fitted) + object$mu.fitted
if(object$censored==FALSE) attr(AIC,"log") <- round(-2*sum(object$lpdf) + 2*(gle) + 2*sum(y), digits=3)
else attr(AIC,"log") <- round(-2*sum(object$lpdf) + 2*(gle) + 2*sum(y[object$event==0]), digits=3)
AIC
}
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