R help - Nov 2009 - reference on contr.helmert and typo on its help page.

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

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

On Nov 8, 2009, at 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?
>
My version of "Modern Applied Statistics in S" (aka MASS) deals with  
it in enough detail for a person with background to understand. At one  
point I asked Ripley whether later editions of MASS expanded the  
coverage of that topic but my memory is that he did not reply. Coming  
from a perspective that emphasized regression, I found it rather terse  
(2 pages), so there might be one of the more recently published texts  
that spends more time developing the concepts from basics.

"Statistical Models in S" also covers the topic (5 pages)  in an early
chapter, again at a level that assumes prior training in ANOVA models.
> BTW, in R version 2.9.1, there is a typo on the help page of
> 'contr.helmert' ('cont.helmert' should be
'contr.helmert').
>
> ______________________________________________
-- 

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

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
>