st: statsby slowness

[David Airey <david.airey@Vanderbilt.Edu>]

.

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

Why?

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

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/