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st: Creating new variables from a STATA panel dataset

From   Lucio Vinhas de Souza <>
Subject   st: Creating new variables from a STATA panel dataset
Date   Wed, 3 Aug 2011 09:14:26 -0700 (PDT)

Dear All,

Very basic question, for someone that has not used STATA for several years now: I have a panel dataset (adequately tis t and iis id) of several hundred variables, and I want to:

a)	Generate new variables
b)	Run a xtbond from those new variables

I have been trying to generate new variables which are change rates form the existing ones. The names of the existing variables are all variations from the format “countrycode_extension”. I have been trying to

gen “*_extension_new”=((“*_extension”-“*_extension_new”[_n-1])/ “*_extension_new”[_n-1])

and always get the message

*invalid name

What and I doing wrong?


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