Dear Iurie,
I want to run Shapiro-Wilk test for each variable in my dataset, each grouped by variable groupFactor.
Note that, at least on a single dependent variable with a grouping variable, a possible simplification may arise when homogeneity of variances is assumed and reasonable. You may want to do a single normality test on group-centered data :
shapiro.test(residuals(lm(data[,1]~groupFactor))) HTH, Yvonnick Noel University of Brittany, Rennes 2 France ______________________________________________ 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.
