On Sun, Nov 8, 2009 at 10:11 AM, Duncan Murdoch <murd...@stats.uwo.ca> wrote:
> On 08/11/2009 11:03 AM, Peng Yu wrote:
>>
>> I'm wondering which textbook discussed the various contrast matrices
>> mentioned in the help page of 'contr.helmert'. Could somebody let me
>> know?
>
> Doesn't the reference on that page discuss them?
It does explain what the functions are. But I need a more basic and
complete reference. For example, I want to understand what 'Helmert
parametrization' (on page 33 of 'Statistical Models in S') is.
>> BTW, in R version 2.9.1, there is a typo on the help page of
>> 'contr.helmert' ('cont.helmert' should be 'contr.helmert').
>
> Thanks, I've fixed the typo.
>
> Duncan Murdoch
>
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