Hello, Since I initiated this discussion some days ago, I discovered a paper that may be of interest:
ANOVA for unbalanced data: Use Type II instead of Type III sums of squares by ØYVIND LANGSRUD Statistics and Computing 13: 163–167, 2003 Ravi Kulkarni -- View this message in context: http://n4.nabble.com/Type-I-v-s-Type-III-Sum-Of-Squares-in-ANOVA-tp1573657p1578273.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.