Dear R Users, Using lm() function with categorical variable R use contrasts. Let assume that I have one X independent variable with 3-levels. Because R estimate only 2 parameters ( e.g. a1, a2) the coef function returns only 2 estimators. Is there any function or trick to get another a3 values. I know that using contrast sum (?contr.sum) I could compute a3 = -(a1+a2). But I have many independent categorical variables and I'm looking for a fast solution.
Robert ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
