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st: RE: error 109

From   Nick Cox <>
To   "''" <>
Subject   st: RE: error 109
Date   Thu, 3 Feb 2011 19:21:33 +0000

In your context -string()- maps numeric variables to string. It takes a variable across the big divide. But if you're already across, it is not needed and indeed illegal. 

Your request needs to be rephrased. The idea of the first 8 numbers of a string makes no sense to Stata. You want the first 8 characters, which no doubt are numeric characters in your case, but that needs a different function. 

Anyway, it should be easy. Try 

gen id_v3 = substr(v3, 1, 8) 


Natalia Batista

I´m tring to create a string variable (id_v3) from another string  
variable (v3). But I want just the 8 first numbers. I tried the  
generate str id_v3 = string(v3,"%-08.0f")

By it did not worked. I got the error 109: type mismatch

How can I solve it?

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