[Limdep Nlogit List] More On Standard Errors of Marginal Effects
William Greene
wgreene at stern.nyu.edu
Fri Mar 20 03:10:33 EST 2009
The extra switch is ;FULL, not ;ALL.
/B. Greene
----- Original Message -----
From: "David Tufte" <tufte at suu.edu>
To: limdep at limdep.itls.usyd.edu.au
Sent: Thursday, March 19, 2009 12:02:36 PM GMT -05:00 US/Canada Eastern
Subject: [Limdep Nlogit List] More On Standard Errors of Marginal Effects
I added the ;all option, and it did not change anything. Here is the section of the output file from a stripped down version of my model.
--> oprobit;
all;
marginal effects;
lhs=inverse;
rhs=one,age,age_sq$
Normal exit from iterations. Exit status=0.
+---------------------------------------------+
| Ordered Probability Model |
| Maximum Likelihood Estimates |
| Model estimated: Mar 18, 2009 at 10:48:39PM.|
| Dependent variable INVERSE |
| Weighting variable None |
| Number of observations 1015 |
| Iterations completed 8 |
| Log likelihood function -1037.060 |
| Number of parameters 5 |
| Info. Criterion: AIC = 2.05332 |
| Finite Sample: AIC = 2.05338 |
| Info. Criterion: BIC = 2.07757 |
| Info. Criterion:HQIC = 2.06253 |
| Restricted log likelihood -1037.590 |
| McFadden Pseudo R-squared .0005110 |
| Chi squared 1.060327 |
| Degrees of freedom 2 |
| Prob[ChiSqd > value] = .5885089 |
| Underlying probabilities based on Normal |
+---------------------------------------------+
+---------------------------------------------+
| Ordered Probability Model |
| Cell frequencies for outcomes |
| Y Count Freq Y Count Freq Y Count Freq |
| 0 24 .023 1 90 .088 2 482 .474 |
| 3 419 .412 |
+---------------------------------------------+
+--------+--------------+----------------+--------+--------+----------+
|Variable| Coefficient | Standard Error |b/St.Er.|P[|Z|>z]| Mean of X|
+--------+--------------+----------------+--------+--------+----------+
---------+Index function for probability
Constant| 1.51834943 .58708329 2.586 .0097
AGE | .01882813 .02661521 .707 .4793 43.1743842
AGE_SQ | -.00017596 .00029120 -.604 .5457 1968.63448
---------+Threshold parameters for index
Mu(1) | .76961147 .04787622 16.075 .0000
Mu(2) | 2.20533491 .05473961 40.288 .0000
+-------------------------------------------------------------------------+
| Summary of Marginal Effects for Ordered Probability Model (probit) |
+-------------------------------------------------------------------------+
Variable| Y=00 Y=01 Y=02 Y=03 Y=04 Y=05 Y=06 Y=07 |
--------------------------------------------------------------------------+
AGE -.0010 -.0025 -.0037 .0073
AGE_SQ .0000 .0000 .0000 -.0001
+---------------------------------------------------------------------------+
| Cross tabulation of predictions. Row is actual, column is predicted. |
| Model = Probit . Prediction is number of the most probable cell. |
+-------+-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| Actual|Row Sum| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
+-------+-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 0| 24| 0| 0| 24| 0|
| 1| 90| 0| 0| 90| 0|
| 2| 482| 0| 0| 482| 0|
| 3| 419| 0| 0| 419| 0|
+-------+-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|Col Sum| 1015| 0| 0| 1015| 0| 0| 0| 0| 0| 0| 0|
+-------+-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Regards,
Dave Tufte
David Tufte
Associate Professor
Department of Economics and Finance
School of Business
Southern Utah University
351 W. University Blvd.
Cedar City UT 84720
351 W. University Blvd.
Cedar City UT 847820
351 West Center St.
Cedar City, UT 84720
Office: (435) 586-5407
Fax: (435) 586-5493
http://www.suu.edu/faculty/tufte
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