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st: z/t-value "."?

From   Markus Köller <>
Subject   st: z/t-value "."?
Date   Thu, 17 Apr 2008 17:55:32 +0200

Hello everyone,
itŽs me again - I did some regressions and for some variables, which I expect to be highly significant, Stata gives me no t or z-statistics, but only a "."


Variable: Age    Coeff:0,64   z:.

Do you know, what that means? 
Thank you for your help,
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