You can take a look at this, in Vietnamese but you can Gtranslate it http://www.ytecongcong.com/2013/04/scheirer-ray-hare-test-kiem-dinh-phi-tham-so-two-way-anova/ -- View this message in context: http://r.789695.n4.nabble.com/Scheirer-Ray-Hare-tp3818476p4665439.html Sent from the R help mailing list archive at Nabble.com.