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...y aim is to create a matrix of predicted percentiles and the corresponding the fitted model's sigma mu nu by agebins. Q: How do it generate these parameters as in L M S per Cole and Green 1992? Here are my working codes. Name of fitted model is gamlssfit > Agebin<-seq(6,36,6) >centmatx <-centiles.pred(gamlssfit,xname="agemos",xvalues=Agebin,cent=c(10,25,50,75,90)) Although I got matrix of the percentiles by agebins, I want to obtain the L M S/sigma mu nu corresponding to the same agebins. Any help here will be appreciated. Thanks, Y Addo -- View this message...