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From |
Jen Zhen <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Which command to test whether proportions of categories are the same in two sets of people? |

Date |
Fri, 29 Jan 2010 13:33:17 -0500 |

Many thanks for your replies, the Hotelling test seems to do a good job for what I want. One follow-up question though would be whether it might be even better to instead use (for both the continuous and the categorical, but ordered variable) a non-parametric test, like the Wilcoxon-Mann-Whitney test? Power is not an issue, as our sample is quite large... Thanks, J On Wed, Jan 27, 2010 at 11:41 AM, Austin Nichols <[email protected]> wrote: > Jen Zhen <[email protected]> : > You've gotten advice on testing equality of means/proportions one by > one, but let me urge you to do a joint test. Categorical variables > can be broken into dummy variables (all but one category turned into > that many dummies), and then you can use -hotelling- to test equality > of all relevant means (AKA proportions for dummy variables) across > treatment and control. This is commonly called a test of balance, and > Hotelling's test can also be done using a regression of a treatment > dummy on all variables whose means should be equal across groups, > which suggests natural generalizations using e.g. various robust VCEs: > http://www.stata.com/statalist/archive/2009-02/msg01191.html > > On Wed, Jan 27, 2010 at 10:34 AM, Jen Zhen <[email protected]> wrote: >> Hi there, >> >> I have a summary table with members from (1) the treatment group and >> (2) the control group of an experiment, and would like to provide for >> each observable variable a formal test for whether the two sets of >> people come indeed from the same population. For the continuous normal >> variables, I am just doing a t-test to test for equality of means, but >> I'm not fully sure what to do instead for the categorical variables >> (with more than 2 categories). >> >> I found the -csgof- command for a Chi-Square test of whether the >> proportions of the different categories in one sample correspond to >> those coming from some hypothesis, but which command would you use to >> test whether the proportions in the two groups are identical? >> >> Thanks, >> J > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/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/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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