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From |
"Martin Weiss" <[email protected]> |

To |
<[email protected]> |

Subject |
st: Confidence Interval for Proportion |

Date |
Tue, 11 Mar 2008 14:24:42 +0100 |

Dear Statalisters, try this in Stata: ************************ sysuse auto, clear proportion rep78 matrix define A=e(b) matrix define B=e(V) count if rep78!=. *Upper/Lower Bound for proportion of "1" di A[1,1]+invnormal(1-0.05/2)*sqrt(A[1,1]*(1-A[1,1])/`r(N)') di A[1,1]-invnormal(1-0.05/2)*sqrt(A[1,1]*(1-A[1,1])/`r(N)') *Standard Error for "1" *Mistake obviously there... di sqrt(A[1,1]*(1-A[1,1])/`r(N)') ************************ Then let me know: why do I not hit the correct CI for the proportion of "1" in the repair record? Something`s wrong with the standard error, I do not know what, though... Martin Weiss * * 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/

**Follow-Ups**:**st: RE: Confidence Interval for Proportion***From:*"Nick Cox" <[email protected]>

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