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Re: st: test of coefficients of the same regression equation


From   Nahla Betelmal <nahlaib@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: test of coefficients of the same regression equation
Date   Fri, 15 Feb 2013 11:37:09 +0000

Great, many thanks Florian

Kindest regards

Nahla


On 15 February 2013 10:59, Florian Wendelspiess Chávez Juárez
<florian@chavezjuarez.com> wrote:
> Dear Nahla
>
> No, to test the mean you would use the command ttest. In this case you are
> using test, hence you are testing linear hypothesis. Check the help files of
> the two commands and you will see the difference.
>
> Best regards,
> Florian
>
>
>
> On 15-Feb-13 11:49, Nahla Betelmal wrote:
>>
>> hi Florian,
>>
>> Thanks for the reply. Would not that test the difference of the mean
>> between the two variables rather than testing the difference between
>> coefficients themselves?
>>
>> Thanks again
>>
>> Nahla
>>
>> On 15 February 2013 10:42, Florian Wendelspiess Chávez Juárez
>> <florian@chavezjuarez.com> wrote:
>>>
>>> Hi Nahla
>>>
>>> I think you can simply use:
>>> test [mean]NSP = [mean]Times_2
>>>
>>>      or even
>>>
>>> test NSP = Times_2
>>> in this case, since there is only one equation as I see.
>>>
>>> I hope this help.
>>> Best regards,
>>> Florian
>>>
>>>
>>>
>>> On 15-Feb-13 11:29, Nahla Betelmal wrote:
>>>>
>>>> Dear Statalist,
>>>>
>>>> I am trying to test the equality of coefficients b1 and b3 of the same
>>>> regression equation
>>>>
>>>> reg Y NSP Q Times_2
>>>>
>>>> est store alltwo
>>>>
>>>> suest alltwo
>>>>
>>>> test [alltwo_mean]NSP = [alltwo_mean]times_2
>>>>
>>>> I got the error message : equation [alltwo_mean] not found
>>>> r(303);
>>>>
>>>> All goes well till the test part. However, I had no problem using the
>>>> same steps when I wanted to test the coefficients equality  between
>>>> two different regression. equations.
>>>>
>>>> It would be great if you let me know what I am doing wrong and the
>>>> right way to test the coefficents of the same regression equation.
>>>>
>>>> Many thanks
>>>>
>>>>
>>>> Nahla
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