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st: xtprobit results without data for std.err

From   "Basti Boss" <>
Subject   st: xtprobit results without data for std.err
Date   Sun, 15 Jan 2012 12:16:57 +0100 (CET)


i´ve got a serious problem. I have a panel dataset and want to estimate a heckman two-step. So first step is to estimate the xtprobit for the selection equation. The stata results/ output after my xtprobit estimation (which took me 6hours) looks like:

varname | Coef.  Std. Err.  z  P>|z|  [95% Conf. Interval]

name         0,23       -        -      -                  - 
name2       1,46       -        -      -                  -
/lnsig2u     37.33.   .200           36.94         37.73
sigma_u 1.28e+08 1.29e+07       1.05e...     1.56e...
rho               1           1.22e..                 1             1

with no results for the significance etc. How could this happen? And how can I fix this problem... 

I would be very thankfull if there is anybody who could help me with this!!

Thanks a lot



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