Message-ID: <366c6f340911080859u6ab5872ev4da81a4da0b646aa@mail.gmail.com>
Date: 2009-11-08T16:59:55Z
From: Peng Yu
Subject: reference on contr.helmert and typo on its help page.
In-Reply-To: <4AF6EDC4.50804@stats.uwo.ca>
On Sun, Nov 8, 2009 at 10:11 AM, Duncan Murdoch <murdoch at 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
>