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st: syntax to get elements from posted matrices


From   Mirko <mirko.moro@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: syntax to get elements from posted matrices
Date   Fri, 24 Jun 2011 11:02:10 +0200

Dear Statalister,

After posting two matrices, I have a table that looks like this:


------------------------------------------------------------------------------
             |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
num          |
   _at#Z     |
        1 0  |   5.248057   .0670085    78.32   0.000     5.116723    5.379391
        1 1  |   5.099754   .1246989    40.90   0.000     4.855348    5.344159
        2 0  |   5.305705   .0552234    96.08   0.000      5.19747    5.413941
        2 1  |   5.167257   .1058787    48.80   0.000     4.959739    5.374776
        3 0  |   5.363354   .0446693   120.07   0.000     5.275804    5.450904
        3 1  |   5.234761   .0889918    58.82   0.000      5.06034    5.409182
        4 0  |   5.421003   .0364322   148.80   0.000     5.349597    5.492408
        4 1  |   5.302265   .0753494    70.37   0.000     5.154583    5.449947
        5 0  |   5.478651   .0323342   169.44   0.000     5.415277    5.542025
        5 1  |   5.369768   .0669647    80.19   0.000      5.23852    5.501017
        6 0  |     5.5363   .0339106   163.26   0.000     5.469836    5.602763
        6 1  |   5.437272   .0658768    82.54   0.000     5.308156    5.566388
        7 0  |   5.593948   .0405044   138.11   0.000     5.514561    5.673335
        7 1  |   5.504776   .0724155    76.02   0.000     5.362844    5.646708
        8 0  |   5.651597   .0501748   112.64   0.000     5.553256    5.749938
        8 1  |   5.572279   .0848351    65.68   0.000     5.406006    5.738553
        9 0  |   5.709245   .0614871    92.85   0.000     5.588733    5.829758
        9 1  |   5.639783   .1009889    55.85   0.000     5.441849    5.837718
       10 0  |   5.766894   .0736888    78.26   0.000     5.622467    5.911322
       10 1  |   5.707287   .1193702    47.81   0.000     5.473325    5.941248
       11 0  |   5.824543   .0864041    67.41   0.000     5.655194    5.993892
       11 1  |   5.774791   .1390989    41.52   0.000     5.502162    6.047419
       12 0  |   5.882191   .0994361    59.16   0.000       5.6873    6.077082
       12 1  |   5.842294   .1596763    36.59   0.000     5.529334    6.155254
       13 0  |    5.93984   .1126749    52.72   0.000     5.719001    6.160679
       13 1  |   5.909798   .1808128    32.68   0.000     5.555411    6.264184
-------------+----------------------------------------------------------------
den          |
         _at |
          1  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          2  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          3  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          4  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          5  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          6  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          7  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          8  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
          9  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
         10  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
         11  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
         12  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
         13  |    .000015   3.21e-06     4.68   0.000     8.73e-06    .0000213
------------------------------------------------------------------------------

I wish to take the ratio between 5.099754 (the second coefficient in
the first [num] panel, corresponding to the marginal effects of Z =1
evaluated at 1) and 0.00015 (the value of [den] evaluated at 1), how
should I write the –nlcom- command?

I know how to get the denominator, i.e., [den]_b[1._at] , but I don’t
know the syntax for the numerator!

Hopefully somebody can help.

Thanks
Mirko

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