<>
The answer depends on whether the strings are unique (easy!) or not. Let`s
assume the latter:
*************
clear*
inp str20 mystring
"hello"
"good bye"
"good morning"
"yesterday"
"today"
"tomorrow"
"today"
"yesterday"
end
compress
replace mystring=trim(mystring)
sort mystring
egen tag=tag(mystring)
gen x2=sum(tag)
list, noobs
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von John Bunge
Gesendet: Dienstag, 20. Oktober 2009 12:08
An: [email protected]
Betreff: st: combination foreach forvalues
Dear all
I have a string variable x1 with a list of values. I want to create a
numerical variable x2 in which the numbers correspond to the string values
in x1 in an ordered fashion (as a counter).
To illustrate, lets assume x1 contains all letters of the alphabet, and I
want x2 to contain a counter that corresponds to the position of the letter
in the alphabet, i.e. x1=a > x2=1, x1=b > x2=2, x1=c > x2=3, etc...
This seems to me like a combination of foreach and forvalues, but I cannot
find information on whether and how such thing is implementable in Stata.
Hope I have made myself clear.
Thanks for your help
John.
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*
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
