On Feb 2, 2010, at 11:38 PM, Peng Yu wrote:
?contrast in the contrast package gives me the following description.
However, I have no idea what Type II and III contrasts are. Could
somebody explain it to me? And what does 'type' mean here?
*‘type’*: set ‘type="average"’ to average the individual contrasts
(e.g., to obtain a Type II or III contrast)
In no particular order:
http://courses.washington.edu/b570/handouts/type3ss.pdf
http://core.ecu.edu/psyc/wuenschk/SAS/SS1234.doc
http://n4.nabble.com/a-kinder-view-of-Type-III-SS-td847282.html
Don't expect any follow-up questions to be answered or further
citations offered. This is really more in the realm of statistics
education than an R specific question.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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