Nothing
dtp3 <-
function(x, mu, par1, par2, FUN,param = "tp", log = FALSE ){
if(param == "tp")
{
ifelse( par1 > 0 & par2 > 0,
logPDF <- log(2) + ifelse( x < mu ,FUN( (x-mu)/par1, log=T), FUN( (x-mu)/par2, log=T)) - log( par1+par2 ),
logPDF <- 'invalid arguments: par1 or/and par2 is/are not positive in the parametrization tp' )
}
if(param == "eps")
{
sigma = par1 ; gamma = par2
ifelse( sigma > 0 & abs(gamma) < 1,
logPDF <- ifelse( x < mu,FUN( (x-mu)/(sigma*(1+gamma)), log=T ),FUN( (x-mu)/(sigma*(1-gamma)), log=T ) ) - log( sigma ),
logPDF <- 'invalid arguments: par1 is not positive or/and abs(par2) is not less than 1 in the parametrization eps' )
}
if(param == "isf")
{
sigma = par1; gamma = par2
ifelse( sigma > 0 & gamma > 0,
logPDF <- log(2) + ifelse( x < mu,FUN( (x-mu)/(sigma*gamma), log=T ),FUN( (x-mu)/(sigma/gamma), log=T) ) - log( sigma*(gamma+1/gamma) ),
logPDF <- 'invalid arguments: par1 or/and par2 is/are not positive in the parametrization isf' )
}
ifelse( is.numeric(logPDF),ifelse( log, return(logPDF), return(exp(logPDF)) ), logPDF )
}
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