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st: statsby slowness

From   David Airey <david.airey@Vanderbilt.Edu>
Subject   st: statsby slowness
Date   Mon, 13 Aug 2007 22:39:38 -0500


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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