Rene Weber wrote
> Dear colleagues,
> I'm searching a paper which helps me to understand the exact
> (mathematical) meaning of the type I to IV sum of squares and
> which hypotheses can be tested with the different types. The
> available literature seems to be not homogeneous and is (in my
> opinion) very confusing (especially in terms of nonorthogonal
> variance analysis).
I have a paper and two heavily annotated computer programs that
discuss the mathematical and functional aspects of SAS Type I,
II, and III sums of squares in unbalanced (and balanced) analysis
of variance (ANOVA). (SAS Type IV sums of squares are also
briefly discussed.) The programs are written in SAS IML, but one
need not understand SAS or IML to understand the material.
The material is available at
http://www.matstat.com/ss/
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Donald B. Macnaughton MatStat Research Consulting Inc
[EMAIL PROTECTED] Toronto, Canada
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