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...l<-Lm (y~X1+X2) My question is on the residual plot, it looks like three cluster because I have three tool types. Is such a plot is ok with the constant variance assumption and normality (below is a link for the plot)?I have never seen such a plot of the residuals http://www.nabble.com/file/p22972254/question.JPG question.JPG -- View this message in context: http://www.nabble.com/residuals-tp22972254p22972254.html Sent from the R help mailing list archive at Nabble.com.