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

[Florian Wendelspiess Chávez Juárez <florian@chavezjuarez.com>]

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
> > > *
> > > *   For searches and help try:
> > > *   http://www.stata.com/help.cgi?search
> > > *   http://www.stata.com/support/faqs/resources/statalist-faq/
> > > *   http://www.ats.ucla.edu/stat/stata/
> >
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/help.cgi?search
> > *   http://www.stata.com/support/faqs/resources/statalist-faq/
> > *   http://www.ats.ucla.edu/stat/stata/
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/faqs/resources/statalist-faq/
> *   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/