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st: combining two variables into one with matching type

From   Shawn DuBravac <>
To   "" <>
Subject   st: combining two variables into one with matching type
Date   Sun, 8 Dec 2013 13:32:01 -0500

Trying to combine two variables into 1, but getting "type mismatch" despite the fact both variables have the same format

. gen str5 zipcode1 = string(zipcode,"%05.0f")
. destring zip, generate(zip1)
zip has all characters numeric; zip1 generated as long
(32340 missing values generated)

. gen str5 z1 = string(zip1,"%05.0f")

. gen zipfinal= z1

. replace zipfinal=zipcode1 if zipfinal==.
type mismatch

end of do-file

. do "C:\Users\SDUBRA~1.CE\AppData\Local\Temp\STD01000000.tmp"

. describe zipcode1 z1 zipfinal

              storage  display     value
variable name   type   format      label      variable label
zipcode1        str5   %9s                    
z1              str5   %9s                    
zipfinal        str5   %9s                    

end of do-file 

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