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From |
"Austin Nichols" <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: display commands generated within foreach-loop |

Date |
Tue, 20 Nov 2007 11:10:40 -0500 |

Svend-- I almost agree with you. To my eyes, the pattern for Stata is to report lots of identifying information (varnames, etc) for estimates, and virtually none for tests, so various commands for a two-sided test of the null of no difference in means across two groups produce different output based on how Stata thinks of them: sysuse auto, clear foreach x of varlist mpg { ttest `x', by(for) } di r(t)^2 foreach x of varlist mpg { hotelling `x', by(for) } foreach x of varlist mpg { reg `x' for test foreign } foreach x of varlist mpg { mean `x', over(for) test _b[Domestic]=_b[Foreign] } but I can imagine any single user having a different set of desiderata for default display options, and optionally specified bits as well. Learning how to use the return codes to -display- what you want is almost always better than asking Stata to bloat the existing commands with extra options, IMHO. In writing the above example, I was struck by the difference between the VCE and deg. of freedom from -mean- vs. all the other options... Once you relax the assumption of equal variances, you get quite a range of p-values: sysuse auto, clear qui ttest mpg, by(for) uneq loc pt=r(p) qui mean mpg, over(for) qui test _b[Domestic]=_b[Foreign] loc pm=r(p) qui reg mpg for, r qui test for loc pr=r(p) reg mpg if for==1 est sto for reg mpg if for==0 suest . for qui test [_LAST_mean]_cons=[for_mean]_cons loc ps=r(p) di `pt', `pm', `pr', `ps' On 11/20/07, Svend Juul <SJ@soci.au.dk> wrote: > However, I think that Thorstens problem illustrates a > design problem with the -ttest- output; the names > of the variables involved ought to be included in the > output. * * 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/

**References**:**Re: st: display commands generated within foreach-loop***From:*"Svend Juul" <SJ@SOCI.AU.DK>

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