what is the model fd in lifege can you use weibull as survival function what is the standard survival function of lifereg what is lognormal survival function liferig what are the model parameters used what does licegeg and lifereg do what functions does nlmixed work with what is the wlogl parameter in lifreg what is the logical survival function in lifereg what is lognormal survival function nlmixed what is lifereg lifreg and nlmixed what is lognormal survival function how to implement log normal survival model in nlmixed what is the difference between weibull and liffeg what is logging function can proc weibull do lognormal survival? does proc lifereg have lognormal model what model does lifeg use does lifereg use log functions in liceg