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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Trouble producing population standard deviations with collapse (sd) |

Date |
Fri, 13 Jul 2012 23:35:31 -0400 |

Matt Vivier <mvivier@remedypartners.net>: Also collapse the count N for each var, then multiply each SD by sqrt((N-1)/N) On Fri, Jul 13, 2012 at 4:36 PM, Matt Vivier <mvivier@remedypartners.net> wrote: > Hello all, > > My specs are: > Stata/IC 12.1 for Windows (64-bit x86-64) > Revision 06 Feb 2012 > > I am having some trouble getting collapse to produce the result I am > looking for. I have done some searching, and have not found anyone > else presenting this problem. I need it to generate the population > standard deviation for a large number of subsets of data, but it > appears the command I am using is generating a sample standard > deviation. Each subset of the data represents 100% of the population I > am interested in the SD for. Is there a simple way to do this, or will > I need to compute the SD using another process? > > My code is as follows: > > collapse (sum) TotCost TotAcute TotPostAcute ReadmissionCost > ReadmissionClaims count (sd) SDTotCost=TotCost > SDTotPostAcute=TotPostAcute SDReadmissionCost=ReadmissionCost (mean) > AvgTotCost=TotCost AvgTotPostAcute=TotPostAcute > AvgReadmissionCost=ReadmissionCost, by(drg_condition TriggerProvider > year) > * * 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: Trouble producing population standard deviations with collapse (sd)***From:*Matt Vivier <mvivier@remedypartners.net>

**References**:**st: Trouble producing population standard deviations with collapse (sd)***From:*Matt Vivier <mvivier@remedypartners.net>

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