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Re: st: replacement


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: replacement
Date   Tue, 16 Aug 2011 16:19:46 +0200

On Tue, Aug 16, 2011 at 3:51 PM, Gannaway Jack WWG HWWD  wrote:
>> I have a table where each observation has a letter as the value for a
>> number of the variables, e.g.
<snip>
>> For each variable, there is a unique set of numbers which correspond
>> to the letters:
<snip>
>> Can anyone explain a neat way of replacing all the letters with their
>> relevent numeric score?


I originally thought about using a -merge- strategy, though I am not
sure it is much better than using -replace-. As long as you do either
in a .do-file and save that .do-file and _not_ the data, either
solution should be easily reproducible, readable, check-able and
correctable.

*----------- begin example -------------
clear
input ///
str1 v1 n1 str1 v2 n2 str1 v3 n3
     a  0       a  0       a  0
     b  3       b  1       b  1
     c  5       c  2       c  5
     d  9       d  5       d  10
end	
tempfile mask
save `mask'

clear
input ///
Ob str1 v1 str1 v2 str1 v3
 1      a       a       b
 2      c       d       a
 3      b       c       b
 end

merge m:1 v1 using `mask', keepusing(n1)
assert _merge != 1	
drop if _merge == 2
drop _merge

merge m:1 v2 using `mask', keepusing(n2)
assert _merge != 1	
drop if _merge == 2
drop _merge

merge m:1 v3 using `mask', keepusing(n3)
assert _merge != 1	
drop if _merge == 2
drop _merge

list
*----------------------- end example ------------------
(For more on examples I sent to the Statalist see:
http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------
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