See ?shapiro.test
...the number of non-missing values must be between 3 and 5000. By the way, how reasonable testing normality of 3 values? Best ozgur -- View this message in context: http://r.789695.n4.nabble.com/shapiro-test-tp4634513p4634520.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.