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From |
"David E Moore" <davem@hartman-group.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: t-test command for simple cross-tabs |

Date |
Thu, 27 May 2004 10:32:27 -0700 |

Why don't you simply partition the chi-square and test for specific subtables? Granted, there isn't a button you can push to generate all possible subtables, but I'm sure you don't want to do that anyway. > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Hoang Thanh > Huong > Sent: Tuesday, May 25, 2004 7:11 PM > To: statalist@hsphsun2.harvard.edu > Subject: Re: st: t-test command for simple cross-tabs > > > Dear all, > > When comparing two proportions from the same survey, I first use command > "svyset" that taking survey design into account. After that I execute a > command "svytab X Y, per se". > > Hope this works. > > Best, > Hoang Thanh Huong > > ----- Original Message ----- > From: "Nick Cox" <n.j.cox@durham.ac.uk> > To: <statalist@hsphsun2.harvard.edu> > Sent: Wednesday, May 26, 2004 3:23 AM > Subject: RE: st: t-test command for simple cross-tabs > > > > There were two interesting articles in TAS which may be relevant. > > > > Comparing Two Proportions from the Same Survey. > > C.J. Wild; G.A.F. Seber > > The American Statistician 47 (Aug. 1993), 178-181. > > > > Difference of Proportions from the Same Survey. > > A.J. Scott; G.A.F. Seber > > The American Statistician 37 (Nov. 1983), 319-320. > > > > As I recall, however, neither boils down to a t-test. > > > > I was very interested in these papers when I read them, > > but never focused on how to do either in Stata. Irrespective > > of whether either is the answer to Claudia's question, > > I would be happy to learn of Stata implementations. > > > > Nick > > n.j.cox@durham.ac.uk > > > > Claudia Solari > > > > > Thank you so much for your response. It is my understanding that a > > > chi-square test can tell me if the relationship between two > > > variable is > > > significant, lets say region (ne, mw, w, s) and age cateories (19-29, > > > 30-34, 35+). The chi-square refers to whole variables, and > > > the t-test is > > > based on the categories, such as proportion in a cell (means or > > > percentages). So, I might want to know if there are significant > > > differnences in age for those who live in the NE versus the South. > > > > > > I know of a free software package that calculates my t-tests > > > (STATS), but > > > I'm not sure how to make STATA do it. I was unable to reach the url > > > that you indicated, so I am not sure if my email is redundant. If you > > > have any further comments, I would love to hear them. > > > > Richard Williams > > > > > > I'm probably showing my ignorance here, but what do you want to do a > > > > t-test > > > > of, and how would it differ from what the chi-square test > > > tells you? In > > > > the special case of 2 X 2 tables, it is possible to do a > > > z-test using the > > > > -prtest- command; see p. 7 of > > > > http://www.nd.edu/~rwilliam/stats1/Categorical-Stata.pdf. Is that > > > > what you > > > > want, or do you have something else in mind? If > > > occupational status is a > > > > continuous variable, you could of course just use the > > > t-test command. > > > > Claudia Solari > > > > > > >I am just trying to find out the command to conduct a > > > t-test for a simple > > > > >crosstab, such as gender by occupational status. I know > > > there is a simple > > > > >command for the chi-square test, wihc is just an option > > > for the tabulate > > > > >command, but I have not found an option for a t-test. > > > > * > > * 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/

**References**:**Re: st: t-test command for simple cross-tabs***From:*"Hoang Thanh Huong" <hhuongneu@cardvn.net>

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