st: RE : unexplainable probit results

[Gaul� Patrick <patrick.gaule@epfl.ch>]

Hello,

I don't know what exactly is going on but it is probably related that you have far too many explanatory variables, especially for a probit, given that you only have around 40 observations.

Best regards,

Patrick Gaul�

________________________________________
De : owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] de la part de Karen Barroga [kbarroga@yahoo.com]
Date d'envoi : vendredi 11 juillet 2008 05:46
� : 'statalist@hsphsun2.harvard.edu'
Objet : st: unexplainable probit results

Hi,

I run my variable using probit and got the results below. How come there are no/missing results (dots) for some variables and yet when I run these variables with no results, I get results?

---------

. probit a_w_wt age schyr ricefyr axsta axsc frel8d erel8d owner_dum sumwsdsyield_t sumincome fsizesum Rizal_dum member_dum cx1wwt cx2wwt co1wwt co2wwt cbwwt obwwt ru1wwt ru2wwt pr1wwt pr2wwt tr1e_wwt tr2c_wwt tr3a_wwt tr4y_wwt

Iteration 0:   log likelihood =  -20.65889
Iteration 1:   log likelihood = -7.8035532
Iteration 2:   log likelihood = -3.6455341
Iteration 3:   log likelihood = -.95822287
Iteration 4:   log likelihood = -.25576662
Iteration 5:   log likelihood = -.07527036
Iteration 6:   log likelihood = -.02337521
Iteration 7:   log likelihood = -.00750029
Iteration 8:   log likelihood = -.00245924
Iteration 9:   log likelihood = -.00081897
Iteration 10:  log likelihood =   -.000276
Iteration 11:  log likelihood = -.00009389
Iteration 12:  log likelihood = -.00003219
Iteration 13:  log likelihood =  -.0000111
Iteration 14:  log likelihood = -3.850e-06
Iteration 15:  log likelihood = -1.341e-06
Iteration 16:  log likelihood = -4.689e-07
Iteration 17:  log likelihood = -1.638e-07
Iteration 18:  log likelihood = -5.265e-08
Iteration 19:  log likelihood = -4.800e-08
Iteration 20:  log likelihood = -7.592e-09
Iteration 21:  log likelihood = -6.152e-09
Iteration 22:  log likelihood = -5.077e-09
Iteration 23:  log likelihood = -5.074e-09  (backed up)
Iteration 24:  log likelihood = -5.073e-09  (backed up)

Probit regression                                 Number of obs   =         43
                                                  LR chi2(27)     =      41.32
                                                  Prob > chi2     =     0.0384
Log likelihood = -5.073e-09                       Pseudo R2       =     1.0000

------------------------------------------------------------------------------
      a_w_wt |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
         age |  -.3867675          .        .       .            .           .
       schyr |   1.086169          .        .       .            .           .
     ricefyr |   .3800124          .        .       .            .           .
       axsta |  -5.547729          .        .       .            .           .
        axsc |   12.72164          .        .       .            .           .
      frel8d |  -9.253356          .        .       .            .           .
      erel8d |     12.346          .        .       .            .           .
   owner_dum |  -3.629787          .        .       .            .           .
sumwsdsyie~t |    1.31215          .        .       .            .           .
   sumincome |  -.0534748   76.72575    -0.00   0.999    -150.4332    150.3262
    fsizesum |   1.128914          .        .       .            .           .
   Rizal_dum |    2.55781          .        .       .            .           .
  member_dum |   3.753627          .        .       .            .           .
      cx1wwt |  -1.092271          .        .       .            .           .
      cx2wwt |   1.702984          .        .       .            .           .
      co1wwt |  -1.846226          .        .       .            .           .
      co2wwt |  -.0006998          .        .       .            .           .
       cbwwt |   2.786398          .        .       .            .           .
       obwwt |   -2.59865          .        .       .            .           .
      ru1wwt |  -3.898595          .        .       .            .           .
      ru2wwt |  -3.928283          .        .       .            .           .
      pr1wwt |  -9.655389          .        .       .            .           .
      pr2wwt |    .829331          .        .       .            .           .
    tr1e_wwt |    2.00484          .        .       .            .           .
    tr2c_wwt |    .010138   90.12691     0.00   1.000    -176.6354    176.6556
    tr3a_wwt |   .0006733   10.95916     0.00   1.000    -21.47889    21.48023
    tr4y_wwt |   1.028878          .        .       .            .           .
       _cons |  -9.091063          .        .       .            .           .
------------------------------------------------------------------------------
Note: 6 failures and 34 successes completely determined.




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