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From |
Richard Moverare <richard.moverare@gmail.com> |

To |
statalist <statalist@hsphsun2.harvard.edu> |

Subject |
st: Illustrate SRS in a graph |

Date |
Thu, 16 Sep 2010 23:43:41 +0200 |

Dear all, I would like to illustrate the uncertainty of a SRS (without replacement) by first creating a dataset with one variable that identifies a number of different groups in the population (N), e.g. 415 units in group A, 634 units in group B, on so forth. Then I would like to draw a number of samples from that population, e.g. 20 different samples and get estimates for the proportion of the population belonging to group A, B, ..., and the confidence interval (95 percent) for those estimates. And finally I would like to, in a graph, illustrate the true population proportion and the 20 different samples with their confidence intervals. This in order to illustrate the uncertainty but also that the confidence interval sometimes do not include the true population value. I have done the first step by using -set obs- to set the population size and using _n to divide that population into a number of groups, but I think it should be possible to do this in a better way. I have done the second step for a single sample using -sample- but I have not found a good solution for getting a number of samples and proportion estimates into a single dataset. Does anyone of you done anything similar or know of somewhere this is done? Or can you help me in some way, or just point in some direction? Any help would be greatly appreciated, All the best, Richard Moverare * * 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/

**Follow-Ups**:**Re: st: Illustrate SRS in a graph***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**Re: st: Illustrate SRS in a graph***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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