ttest does not return a statistic called _b[anything].
What statistic are you trying to bootstrap? r(mu_1)-r(mu_2) seems a possibility.
Also, n() is not an option for bs. Did you mean size()?
Tom
> -----Original Message-----
> From: Siyam,AA (pgr) [mailto:[email protected]]
> Sent: Wednesday, June 12, 2002 1:07 PM
> To: [email protected]
> Subject: st: RE: Bootstrapping and t-tests
>
>
> Sorry that was a typing error of mine - still the error
> message I get tells me:
>
> bs "ttest prert=postrt" "_b[prert] _b[postrt]", reps(50) n(10)
> command: ttest prert=postrt
> statistics: _b[prert] _b[postrt]
> error in statistic: _b[prert]
> r(198);
>
>
> -----Original Message-----
> From: Lee Sieswerda [mailto:[email protected]]
> Sent: 12 June 2002 17:56
> To: '[email protected]'
> Subject: st: RE: Bootstrapping and t-tests
>
>
> At the least, you are missing the right-most square bracket.
> That is, it
> should be _b[postrt] .
>
>
> > -----Original Message-----
> > From: Siyam,AA (pgr) [SMTP:[email protected]]
> > Sent: Wednesday, June 12, 2002 12:54 PM
> > To: [email protected]
> > Subject: st: Bootstrapping and t-tests
> >
> > Dear colleagues,
> >
> > Is possible to run a bootstrapped t-test on the paired-observation
> > variables preert and postrt. I tried the command line below
> >
> > bs "ttest preert=postrt" "_b[preert] _b[postrt", reps(50) n(10)
> >
> > The error message I am getting says:
> > error when command executed on original dataset
> > invalid syntax
> > r(111);
> >
> > Many thanks for your help in advance.
> >
> > Regards,
> > Amani
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
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