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

[Gabor Grothendieck]

On Sun, Nov 8, 2009 at 11:59 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
> 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.
>

Just google for: Helmert contrasts