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Re : st: RE: relevance of the instruments
From
donsaane dontsi <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re : st: RE: relevance of the instruments
Date
Mon, 7 Nov 2011 20:47:55 +0000 (GMT)
I didn't use ivregress or ivreg2 because it does'nt give me significant results. is it very bad to use reg3 ?
donsaane
----- Mail original -----
De : "Millimet, Daniel" <[email protected]>
À : "[email protected]" <[email protected]>
Cc :
Envoyé le : Lundi 7 Novembre 2011 13h21
Objet : st: RE: relevance of the instruments
Given that emploi does not show up as a covariate in the j30b and j30f equations, there is no reason to use reg3. Use -ivregress- or -ivreg2- which will then report specification tests related to the strength of the instruments (and provide you with the necessary references regarding these tests).
****************************************************
Daniel L. Millimet
Research Fellow, IZA
Professor, Department of Economics
Box 0496
SMU
Dallas, TX 75275-0496
phone: 214.768.3269
fax: 214.768.1821
web: http://faculty.smu.edu/millimet
****************************************************
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of donsaane dontsi
Sent: Monday, November 07, 2011 11:17 AM
To: [email protected]
Subject: st: relevance of the instruments
Hi statalist,
I'm running a 3sls model , and I wondering if my instruments are strong. Can we just see it the output results? as example: pdvavg4 is an instrument for j30f. we see that pdvavg4 is significant. It is enough to say that pdvavg4 is a strong instrument?
thanks
reg3 (emploi: emploi = j30f j30b) (j30b = taxeavg4 b5 a2 b2a b2b
b2c a4a a7 a6a ) (j30f = pdvavg4 b5 a2
b2a b2b b2c a4a a7 a6
> a)
Three-stage least-squares regression
----------------------------------------------------------------------
Equation Obs Parms RMSE "R-sq" chi2 P
----------------------------------------------------------------------
emploi 131 2 .4052919 -0.1658 3.45 0.1784
j30b 131 8 .9394929 0.2112 37.17 0.0000
j30f 131 8 .9930078 0.2500 45.75 0.0000
----------------------------------------------------------------------
------------------------------------------------------------------------------
| Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
emploi |
j30f | -.0895928 .0645908 -1.39 0.165 -.2161883 .0370028
j30b | .1245075 .0755103 1.65 0.099 -.02349 .272505
_cons | .0341791 .2257434 0.15 0.880 -.4082698 .4766279
-------------+----------------------------------------------------------------
j30b |
taxeavg4 | .9566036 .1901856 5.03 0.000 .5838467 1.32936
b5 | .011787 .0073776 1.60 0.110 -.0026729 .0262469
a2 | -.004885 .15014 -0.03 0.974 -.299154 .289384
b2a | .0032782 .0052013 0.63 0.529 -.0069162 .0134726
b2b | .004151 .0063073 0.66 0.510 -.008211 .016513
b2c | -.0580875 .0315122 -1.84 0.065 -.1198504 .0036753
a4a | -.0025426 .0044695 -0.57 0.569 -.0113026 .0062174
a7 | .0132198 .2282933 0.06 0.954 -.4342267 .4606664
a6a | (omitted)
_cons | -23.56414 14.58883 -1.62 0.106 -52.15771 5.02944
-------------+----------------------------------------------------------------
j30f |
pdvavg4 | .9825736 .1833886 5.36 0.000 .6231387 1.342009
b5 | -.0090748 .0077313 -1.17 0.240 -.0242279 .0060782
a2 | -.0717486 .1705269 -0.42 0.674 -.4059751 .2624778
b2a | -.0106844 .0054099 -1.97 0.048 -.0212877 -.0000812
b2b | -.0118935 .0065061 -1.83 0.068 -.0246453 .0008583
b2c | -.109557 .0328635 -3.33 0.001 -.1739684 -.0451457
a4a | -.0003704 .004611 -0.08 0.936 -.0094079 .0086671
a7 | .1681194 .237539 0.71 0.479 -.2974484 .6336873
a6a | (omitted)
_cons | 19.01283 15.26012 1.25 0.213 -10.89645 48.92212
------------------------------------------------------------------------------
Endogenous variables: emploi j30b j30f
Exogenous variables: taxeavg4 b5 a2 b2a b2b b2c a4a a7 a6a pdvavg4 ---------------------------------------
donsaane
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