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st: re: text manipulation of tabulate output


From   Kit Baum <Baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: text manipulation of tabulate output
Date   Sat, 19 Apr 2008 10:27:04 -0400

Jacob said

This does not work if a categorical variable has a large number of categories; apparently there is a fairly small limit on how large a local macro can be.

WRONG! This is a common programming mistake (see Appendix B of my book). A statement like

local UNSORTEDLEVELS=r(levels)

is killing you because it has an equals sign, limiting the LHS to the possible length of a Stata string variable. The equivalent statement without the equals sign will allow the contents of macro r(levels) to be copied to UNSORTEDLEVELS up to the maximum length of a local macro, which is at least 165 Kbytes in all but Small Stata. In fact in Stata/SE and Stata/MP a local macro can contain over one million characters (-help limits-).

Kit

Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


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