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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