suppose I have a factor with 4 levels: 'a','b','c','d'. I would like to do analysis of variance using aov() with the factor as independent variable. How can I specify the level "b" as the reference level just like the level "a" would be the reference level if using contr.treatment as the contrast? Thanks
array chip <arrayprofile at yahoo.com> writes:> suppose I have a factor with 4 levels: > 'a','b','c','d'. I would like to do analysis of > variance using aov() with the factor as independent > variable. How can I specify the level "b" as the > reference level just like the level "a" would be the > reference level if using contr.treatment as the > contrast?relevel() should do just that. -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907