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Hello, and sorry for not providing an example. I run a regular linear regression (using lm) and use weights with it (weights = ...). I use "QuantPsych" package, its function lm.beta to extract standardized regression weights from my lm regression object. When I don't use weights, everything is fine. But when I do use weights, I get an error that refers to lm.beta code: "In b * sx : longer object length is not a multiple of shorter...

Hi folks, I have a dataframe df.vars with the follwing structure: var1 var2 var3 group Group is a factor. Now I want to standardize the vars 1-3 (actually - there are many more) by class, so I define z.mean.sd <- function(data){ return.values <- (data - mean(data)) / (sd(data)) return(return.values) } now I can call for each var z.var1 <- by(df.vars$var1, group,