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

 From Nahla Betelmal To statalist@hsphsun2.harvard.edu Subject Re: st: test of coefficients of the same regression equation Date Fri, 15 Feb 2013 10:49:44 +0000

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
>>
>> 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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