which r package does weibull regression estimating use which package for estimating a multi level weibull regression model? what package is used for multilevel weibull regression what model is weibull regression used for? what is a weibull model different packages r estimating multilevel weibull model different packages r what package is used to assemble a weibull regression model? which r package is used to estimating multilevel weibull what is r package weibull which package for estimating a multilevel weibull regression model? what package does the weibull regression use for estimating random intercepts? what software packages are needed in the r environment what package for weibull regression which r package is used for multilevel weibull regression models? which package is used for estimating a multi level weibull regression which r package to use to estimate the multilevel weibull model which package for estimating a multi level weibull regression model estimating multilevel weibull model