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...st for fixed and random effects as well as for quantile regression adding dummies of states and years just like fixed effects). Any help would be highly appreciate Thanks Dimitris ###################################### The code that I use before using the link is: data$lex2<-data$lex^2 data$lex3<-data$lex^3 data$constant<-rep(1,times=length(data$lex)) X<-cbind(data$lex, data$lex2, data$lex3, data$constant) y<-c(data$ban) s<-c(data$state) -- View this message in context: http://www.nabble.com/Quantile-Regression-for-Longitudinal-Data.-Warning-message%3A-In-rq.fit.sfn-t...

...[among others]. [[and I've added the following useful EXAMPLE to the man page of 'mode' src/library/base/man/mode : cex3 <- c("1","1:1","1i","list(1)","args","lm","formals(lm)[[2]]","y~x") lex3 <- sapply(cex3, function(x) eval(parse(text=x))) mex3 <- t(sapply(lex3, function(x) c(typeof(x), storage.mode(x), mode(x)))) dimnames(mex3) <- list(cex3, c("typeof(.)","mode(.)","storage.mode(.)")) mex3 ]] ## Here is my test code revealing th...