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st: RE: Query re -sortpreserve-


From   Joly.Patrick@ic.gc.ca
To   statalist@hsphsun2.harvard.edu
Subject   st: RE: Query re -sortpreserve-
Date   Fri, 20 Jun 2003 12:02:57 -0400

Roger Newson
> I am trying to use -sortpreserve- in Stata 7 and Stata 8 
> under Windows 
> 98/SE. However, there is one problem. My -sortpreserve- 
> programs do not 
> seem to be generating a -`sortindex'- temporary variable, as -[P] 
> sortpreserve- says they should. (A simple example under Stata 
> 8 is given 
> below.) Why should this be the case?
> 
> Best wishes (and thanks in advance)
> 
> Roger
> 
> . prog def nutz1,sortpreserve
>    1. version 8.0
>    2. disp as text "Sort index var: |`sortindex'|"
>    3. sort `sortindex'
>    4. end
> 
> . nutz1
> Sort index var: ||
> varlist required
> r(100);


There is a typo in the manual under [P] sortpreserve (p. 402 under section
'How sortpreserve works').  A leading underscore is missing from the macro
name used for the sortpreserve variable.  References to `sortindex' should
be replaced by `_sortindex' everywhere.  The following will work:

prog def nutz1,sortpreserve
	version 8.0
	disp as text "Sort index var: |`_sortindex'|"
	sort `_sortindex'
end


. nutz1
Sort index var: |__000000|


Patrick Joly
joly.patrick@ic.gc.ca
pat.joly@utoronto.ca
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