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st: missing z-values when using dprobit


From   "Ohinata, Asako" <A.Ohinata@warwick.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: missing z-values when using dprobit
Date   Mon, 26 Nov 2007 22:11:09 -0000

Dear All

I am currently running dprobit with many dummy variables as well as some
continuous variables (i.e. age etc). When I run the regression, some of
the z-values are missing although standard errors are estimated. 

   Y	   |      dF/dx   Std. Err.      z    P>|z|     x-bar  [    95%
C.I.   ]
kid3plus*|          1   2.86e-71        .       .   .149928         1
1
y~3_2kid*|  -.0152587   .4635099    -0.85   0.393   .082327  -.923721
.893204
y~5_2kid*|  -.0141908   .4305676    -0.76   0.450   .056012  -.858088
.829706
yy~7_2kid*|  -.0077011  .2278139        .       .   .035007  -.454208
.438806
y~0_2kid*|  -.0210674   .6707822    -1.15   0.249    .02028  -1.33578
1.29364
Lon~9697*|   .0207249   .5586772     0.72   0.474   .095606  -1.07426
1.11571


Could you please let me know when STATA compute standard errors but not
z-values? 

Thank you very much for your help.

Best Wishes,
Asako

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