Thanks bbolker, that's really helpful. I'll look out for the book too, it could be helpful! Yours, Sam -- View this message in context: http://r.789695.n4.nabble.com/ANOVA-from-imported-data-has-only-1-degree-of-freedom-tp3887528p3891246.html Sent from the R help mailing list archive at Nabble.com.