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Re: st: missing z-values when using dprobit


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: missing z-values when using dprobit
Date   Mon, 26 Nov 2007 22:22:34 +0000 (GMT)

--- "Ohinata, Asako" <A.Ohinata@warwick.ac.uk> wrote:

> 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  
> kid3plus*|          1   2.86e-71        .  <snip>

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

The standard error is in the example is very very small
(0.0000000000000
00000000000000000000000000000000000000000000000000000000286), i.e. de
facto zero. So I am not surprized the z-score is missing. Is kid3plus
the reference category?

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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