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From |
Matt Vivier <mvivier@remedypartners.net> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Mon, 16 Jul 2012 09:39:04 -0400 |

Great, thank you for the help everyone. On Fri, Jul 13, 2012 at 11:35 PM, Austin Nichols <austinnichols@gmail.com> wrote: > 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/ -- Matt Vivier Data Analyst / Stata Programmer Remedy Partners 1 (781) 343-1473 -- ---------------------------------------------------------------------- The information contained in this message may be privileged, confidential, and protected from disclosure. If you are not the intended recipient, or an employee, or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting from your computer. * * 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: Trouble producing population standard deviations with collapse (sd)***From:*Matt Vivier <mvivier@remedypartners.net>

**Re: st: Trouble producing population standard deviations with collapse (sd)***From:*Austin Nichols <austinnichols@gmail.com>

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