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From |
Zoe Hyde <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Comparing multiple sample proportions to population proportions |

Date |
Fri, 16 Sep 2011 14:24:29 +0800 |

Thanks, that's exactly what I need. Zoe. On Thu, Sep 15, 2011 at 06:50:02AM -0400, Austin Nichols wrote: > Zoe Hyde <[email protected]>: > findit mgof > > On Thu, Sep 15, 2011 at 3:54 AM, Zoe Hyde <[email protected]> wrote: > > Hi Everyone, > > > > I know that I can compare a sample proportion to a population proportion > > with either a one-sample Z test or a binomial probability test. > > > > e.g., to see if the proportion of drug use in my sample is different to > > the proportion in the population (16.2%): > > > > > > prtest drug_use == 0.162 > > OR > > bitest drug_use == 0.162 > > > > > > However, I'm wondering what I should do when I have multiple categories. > > > > For example, let's say I have a variable that records smoking status: > > > > > > tab smoke > > > > smoke | Freq. Percent Cum. > > ------------+----------------------------------- > > Current | 11 22.00 22.00 > > Ex-smoker | 12 24.00 46.00 > > Never | 27 54.00 100.00 > > ------------+----------------------------------- > > Total | 50 100.00 > > > > > > I would like to compare these proportions against proprtions > > for the general population, but it seems wrong to do three tests > > (sort of like doing a bunch of Mann Whitney U tests without first > > seeing if a Kruskal-Wallis is significant): > > > > > > bitesti 50 0.22 0.172 > > bitesti 50 0.24 0.285 > > bitesti 50 0.54 0.543 > > > > > > So, I'm wondering what I should do? What would be the correct way to > > see if smoking status in my sample is different from the general > > population? > > > > > > Thanks, > > > > Zoe. > > * > * 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/

**References**:**st: Comparing multiple sample proportions to population proportions***From:*Zoe Hyde <[email protected]>

**Re: st: Comparing multiple sample proportions to population proportions***From:*Austin Nichols <[email protected]>

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