[R] reference on contr.helmert and typo on its help page.

Peng Yu pengyu.ut at gmail.com
Sun Nov 8 17:03:43 CET 2009

I'm wondering which textbook discussed the various contrast matrices
mentioned in the help page of 'contr.helmert'. Could somebody let me

BTW, in R version 2.9.1, there is a typo on the help page of
'contr.helmert' ('cont.helmert' should be 'contr.helmert').

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