Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down on April 23, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
Nick Cox <n.j.cox@durham.ac.uk> |

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

Subject |
RE: st: RE: Test of differences between geometric means |

Date |
Tue, 15 Nov 2011 18:31:25 +0000 |

The majority of user-written programs were written because the programmers wanted to use them themselves. So, you may need to write what you want to use. Meanwhile here is one sketch. *! 0.1.0 NJC 15 Nov 2011 program geomsu, rclass version 9 syntax varname(numeric) [if] [in] marksample touse qui count if `touse' if r(N) == 0 error 2000 qui count if `touse' & `varlist' <= 0 if r(N) > 0 error 411 quietly { tempvar work gen `work' = log(`varlist') if `touse' su `work' local fmt : format `varlist' } di di "geometric mean " `fmt' exp(r(mean)) di "geometric SD " `fmt' exp(r(sd)) return scalar gmean = exp(r(mean)) return scalar gsd = exp(r(sd)) end Nick n.j.cox@durham.ac.uk Junlin Liao I'm wondering if someone could write a procedure to summarize lognormal data automatically in the form of geometric mean and std etc. It's easy to transform data to get the results, but it would be nice if it's automated. The means commands (gmeans or ameans) do not give standard deviation. On Tue, Nov 15, 2011 at 3:41 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > There is I believe some literature on ad hoc tests for this question, but the results of > > . findit lognormal > > do not show any Stata implementations. I'd recast the problem as one of estimating a model using either -glm, link(log) f(normal)- or -lognfit- (SSC). > > Nick > n.j.cox@durham.ac.uk > > N.M.Postel-Vinay@lse.ac.uk > > Is there a test of differences between geometric means, assuming lognormal distributions? * * 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: RE: Test of differences between geometric means***From:*Nick Cox <n.j.cox@durham.ac.uk>

**References**:**st: Test of differences between geometric means***From:*<N.M.Postel-Vinay@lse.ac.uk>

**st: RE: Test of differences between geometric means***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: RE: Test of differences between geometric means***From:*Junlin Liao <junlin.liao.cn@gmail.com>

- Prev by Date:
**Re: st: RE: twoway graph legend** - Next by Date:
**Subject: st: simulating random numbers from zero inflated negative binomial estimates** - Previous by thread:
**Re: st: RE: Test of differences between geometric means** - Next by thread:
**RE: st: RE: Test of differences between geometric means** - Index(es):