[R] How to set initial values in lme ?

Hello R-users, Does anyone know how to set initial values in lme? I have a problem of non convergence and would like to try different inital values. Is lmeScale the right function to do it and how many parameters do we need to specify, only fixed parameters or also random effects ? Thanks for

[R] lme with log-normal distribution of parameters

Dear R-users, Do you know if we can use the function lme in R for log-normal distribution of parameters as used in Nonmem ? theta=theta0*exp(eta) In our model, the parameters follow the log-normal distribution so it's not reasonable to deal with normal distribution which gives us negative valu

Re: [R] How to extract parameter estimates of variance function from lme fit

Thank you Henrique!! It works. Thu Le 15/10/2010 16:53, Henrique Dallazuanna a écrit : coef(fm$modelStruct$varStruct, uncons = FALSE) __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide

[R] How to extract parameter estimates of variance function from lme fit

Dear R-Users, I have a question concerning extraction of parameter estimates of variance function from lme fit. To fit my simulated data, we use varConstPower ( constant plus power variance function). fm<-lme(UPDRS~time,data=data.simula,random=~time,method="ML",weights=varConstPower(fixed=li