Hi Chunlin,

You have to write your own myCmatrix.

Cheers

Andrew


On Wednesday, February 6, 2013, chunlin liu wrote:

> Thanks, Andrew.
>
>
>
> I studied the function "estimable" in package "gmodels"
>
> and realized that it could combine the model coefficients together
>
> if a correct cm matrix is provided. For example, if
>
>
>
> mylm <- lm(y ~ x1 + factor(x2) + x3*factor(x4), mydata)
>
>
>
> Assume that factors x2 and x4 have 6 and 10 levels respectively.
>
> If a correct cm matrix myCmatrix is provided, then
>
>
>
> estimable(mylm, myCmatrix)
>
>
>
> produces all coefficients for the equations/models at all levels.
>
> As I do not know how lm is computed,
>
> does anyone know how to obtain myCmatrix from mylm object?
> Thanks,
>
> -chunlin
>
> On Tue, Feb 5, 2013 at 1:56 AM, Andrew Robinson <mensurationist@gmail.com<javascript:_e({}, 'cvml', 'mensurationist@gmail.com');>
> > wrote:
>
>> I think that the excellent estimable function from gmodels should help
>> you.
>>
>> Cheers
>>
>> Andrew
>>
>>
>> On Tuesday, February 5, 2013, chunlin liu wrote:
>>
>>>  I am wondering how to obtain the model/equation at each level
>>> automatically
>>> in a regression model with a few factors
>>> without looking at summary of the lm model. For example, consider
>>>
>>> lm.factors <- lm(y ~ x1 + factor(x2)*factor(x3)+x4*factor(x5))
>>>
>>> The coefficients of lm.factors in summary(lm.factors) might be
>>> complicated.
>>> I would like to have the equation at each level from lm.factor.
>>> Could you please let me know how to obtain the equation of lm.factors at
>>> each level automatically (not looking at summary(lm.factors))?
>>> Thanks,
>>>
>>> -Chunlin
>>>
>>>         [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
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>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>>
>> --
>> Andrew Robinson
>> Director (A/g), ACERA
>> Department of Mathematics and Statistics            Tel: +61-3-8344-6410
>> University of Melbourne, VIC 3010 Australia               (prefer email)
>> http://www.ms.unimelb.edu.au/~andrewpr              Fax: +61-3-8344-4599
>> http://www.acera.unimelb.edu.au/
>>
>> FAwR: http://www.ms.unimelb.edu.au/~andrewpr/FAwR/
>> SPuR: http://www.ms.unimelb.edu.au/spuRs/
>>
>
>

-- 
Andrew Robinson
Director (A/g), ACERA
Senior Lecturer in Applied Statistics                      Tel:
+61-3-8344-6410
Department of Mathematics and Statistics            Fax: +61-3-8344 4599
University of Melbourne, VIC 3010 Australia
Email: a.robinson@ms.unimelb.edu.au    Website: http://www.ms.unimelb.edu.au

FAwR: http://www.ms.unimelb.edu.au/~andrewpr/FAwR/
SPuR: http://www.ms.unimelb.edu.au/spuRs/

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