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st: RE: RE: Bootstrapping and t-tests


From   "Steichen, Thomas" <STEICHT@RJRT.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Bootstrapping and t-tests
Date   Wed, 12 Jun 2002 13:24:38 -0400

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:A.A.Siyam@lse.ac.uk] 
> Sent: Wednesday, June 12, 2002 1:07 PM
> To: statalist@hsphsun2.harvard.edu
> 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:Lee.Sieswerda@tbdhu.com]
> Sent: 12 June 2002 17:56
> To: 'statalist@hsphsun2.harvard.edu'
> 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:A.A.Siyam@lse.ac.uk]
> > Sent:	Wednesday, June 12, 2002 12:54 PM
> > To:	statalist@hsphsun2.harvard.edu
> > 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
> > *
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