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st: re: simultaneous equations


From   mmolina@uniroma3.it
To   statalist@hsphsun2.harvard.edu
Subject   st: re: simultaneous equations
Date   Fri, 27 Feb 2009 11:43:54 +0100 (CET)

Dear Statlist,
Here I am. As you adviced me I tried ivregress 2sls ... and obtained:

ivregress 2sls expshare b2b l1 age l4a (normscore = l11a l10),
note: l10 dropped because of collinearity

Instrumental variables (2SLS) regression               Number of obs =
198
                                                       Wald chi2(5)  =
40.30
                                                       Prob > chi2   =
0.0000
                                                       R-squared     =
  .
                                                       Root MSE      =
7.9e+07

------------------------------------------------------------------------------
    expshare |      Coef.   Std. Err.      z    P>|z|     [95% Conf.
Interval]
-------------+----------------------------------------------------------------
   normscore |   4.04e+08   3.93e+08     1.03   0.304    -3.66e+08
1.18e+09
         b2b |  -238087.7     387449    -0.61   0.539    -997473.9
521298.5
          l1 |   66040.49   14947.01     4.42   0.000     36744.89
95336.09
         age |   134492.7   220864.6     0.61   0.543    -298393.9
567379.3
         l4a |  -95654.77   20067.76    -4.77   0.000    -134986.9
-56322.68
       _cons |  -1.33e+08   1.18e+08    -1.13   0.260    -3.65e+08
9.85e+07
------------------------------------------------------------------------------
Instrumented:  normscore
Instruments:   b2b l1 age l4a l11a

I agree with and don't know why the constant term is dropped.
I was looking for some causality link between normscore and expshare, and
supossed Simultaneous Equations may help me.

Thanks and regards,

Alejandra Molina

st: re: simultaneous equations

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