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st: statsby slowness

From   David Airey <david.airey@Vanderbilt.Edu>
Subject   st: statsby slowness
Date   Tue, 14 Aug 2007 00:13:31 -0500


I have found Blasnik's statsbyfast improvement, but for some reason it is broken in Stata 10.

At what point does one give up using statsby? With just three variables in my data set,

ssrownum, iso_VSV, expression

the following command does OK with 1000 by groups (< 20 cases in a group), but is not useable with 20,000 by groups.

statsby n=r(N) spearman=r(rho) p=r(p), by(ssrownum): spearman iso_VSV expression


I posted something similar a long time ago compared speeds of ttest with if versus in and versus regress, but I'm not happy at the moment.

David C. Airey, Ph.D.
Research Assistant Professor

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