Nothing
surv.dist <- function(t, base.dist, parms, xbeta, alpha, res){
if(base.dist=="Weibull") exp(-(parms[1]*t)^parms[2]*exp(xbeta+alpha))-res
else if(base.dist=="loglogistic") (1+(parms[1]*t)^parms[2])^(-exp(xbeta+alpha)) -res
else if(base.dist=="Gompertz") exp(-(parms[1]*(exp(parms[2]*t)-1)/parms[2])*exp(xbeta+alpha)) -res
else if(base.dist=="lognormal"){
x <- (log(t)-parms[1])/parms[2]
H <- -log(1-pnorm(x))
exp(-H*exp(xbeta+alpha))-res
}
else if(base.dist=="gamma"){
H <- -log(1-pgamma(t,shape=parms[1], scale=parms[2] ))
exp(-H*exp(xbeta+alpha)) - res
}
else if(base.dist=="logBurr") (1+(parms[1]*t)^parms[2]/parms[3])^(-parms[3]*exp(xbeta+alpha)) -res
else stop("Unrecognized baseline distribution")
}
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