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st: Overid on ivprobit


From   Abekah Nkrumah <ankrumah@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Overid on ivprobit
Date   Thu, 3 May 2012 23:58:49 +0100

Dear All,

I am trying to use overid after ivprobit but stata returns an error
message. I have checked several times and seem not to know what is
happening. Can some one help. The results is below

 ivprobit place_deliv  woman_age_yrs woman_age_yrssq i.birth_order2
age_at_1st_birth i.moda_edu12 (empowerment12= age_polig
clusta_death_dif
> f) if year==2003, twostep
Checking reduced-form model...

Two-step probit with endogenous regressors        Number of obs   =      2437
                                                  Wald chi2(8)    =    329.42
                                                  Prob > chi2     =    0.0000

------------------------------------------------------------------------------
             |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
empowerme~12 |   5.378231   1.129086     4.76   0.000     3.165263    7.591199
woman_age_~s |   .1238111   .0532797     2.32   0.020     .0193848    .2282374
woman_age_~q |   -.001565   .0007225    -2.17   0.030     -.002981    -.000149
             |
birth_order2 |
          2  |  -.5072639   .1132554    -4.48   0.000    -.7292403   -.2852875
          3  |   -.764831   .1393952    -5.49   0.000    -1.038041   -.4916214
          4  |  -1.025213   .1708814    -6.00   0.000    -1.360135    -.690292
             |
age_at_1st~h |  -.0200801   .0114204    -1.76   0.079    -.0424637    .0023036
1.moda_edu12 |    .288899   .1405919     2.05   0.040      .013344     .564454
       _cons |  -4.307615    .606373    -7.10   0.000    -5.496084   -3.119146
------------------------------------------------------------------------------
Instrumented:  empowerment12
Instruments:   woman_age_yrs woman_age_yrssq 2.birth_order2 3.birth_order2
               4.birth_order2 age_at_1st_birth 1.moda_edu12 age_polig
               clusta_death_diff
------------------------------------------------------------------------------
Wald test of exogeneity:     chi2(1) =    15.90           Prob > chi2 = 0.0001

. overid

1b:  operator invalid
r(198);



Gordon
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