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Re: st: Including constant?


From   Daniel Marcelino <dmsilva.br@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Including constant?
Date   Fri, 3 Jun 2011 14:59:59 -0300

This discussion lead me think about the point.
In theory, the constant could be removed from models. Although, in
practice we do not usually do that. The p-value for a particular
constant may be used to determine whether keep or drop it. If you drop
the constant your model should look likes this  Y = b1 X, of course
the problem here is that Y should be interpreted as 0 when X is 0.

Daniel

On Thu, Jun 2, 2011 at 12:15 PM, Richard Williams
<richardwilliams.ndu@gmail.com> wrote:
> At 12:31 AM 6/2/2011, Nils Braakmann wrote:
>>
>> Interesting to learn about these disciplinary differences. In
>> economics the most common thing nowadays seems to be to only report
>> coefficients/results for your main variable of interest, omit results
>> for control variables, constants etc.  and just mention that these
>> were included somewhere in the text/a table footnote.
>>
>> Cheers,
>> Nils
>
> I am not crazy about that but yes, especially if you have a zillion
> variables, I can see doing it that way. I would hope that the complete
> results are available upon request. One problem with such an approach is
> that it might obscure the fact that the variables of interest have pretty
> small effects compared to everything else. It might also hide suspicious
> results that could call the rest of the findings into question.
>
>
> -------------------------------------------
> Richard Williams, Notre Dame Dept of Sociology
> OFFICE: (574)631-6668, (574)631-6463
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>
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-- 
Daniel Marcelino
http://danielmarcelino.zip.net
Skype: d_marcelino

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