Spost13 problem

[Haseok Oh]

I'm trying to use Spost13 package to perform logit regression analysis.
But there is some problem.
If I typed "mtable, atmeans stat(all)" there is no problem.
But If I typed "mtable, atmeans pr(0 1) stat(all)" there is Error.

Error is "Margin_0: operator invalid" r(198).

I typed "ado" and uninstalled Spost13 and Spost9 and I reinstalled Spost13. But the problem is repeated.

How can I solve this problem? I reinstalled STATA17 but the problem is not solved....

[William Lisowski]

The following example duplicates your mtable syntax but does not encounter your error.

sysuse auto, clear
logit foreign price weight
mtable, atmeans pr(0 1) stat(all)

. sysuse auto, clear
(1978 automobile data)

. logit foreign price weight

Iteration 0:   log likelihood =  -45.03321  
Iteration 1:   log likelihood =  -22.92708  
Iteration 2:   log likelihood = -18.834379  
Iteration 3:   log likelihood = -17.996532  
Iteration 4:   log likelihood = -17.976397  
Iteration 5:   log likelihood = -17.976341  
Iteration 6:   log likelihood = -17.976341  

Logistic regression                                     Number of obs =     74
                                                        LR chi2(2)    =  54.11
                                                        Prob > chi2   = 0.0000
Log likelihood = -17.976341                             Pseudo R2     = 0.6008

------------------------------------------------------------------------------
     foreign | Coefficient  Std. err.      z    P>|z|     [95% conf. interval]
-------------+----------------------------------------------------------------
       price |   .0009296   .0002999     3.10   0.002     .0003418    .0015174
      weight |  -.0058785   .0016986    -3.46   0.001    -.0092078   -.0025493
       _cons |   9.000473   2.627577     3.43   0.001     3.850517    14.15043
------------------------------------------------------------------------------

. mtable, atmeans pr(0 1) stat(all)

Expression: Pr(foreign), predict(pr)

           | Domestic   Foreign
 ----------+-------------------
    Margin |    0.953     0.047
        se |    0.046     0.046
         z |   20.632     1.009
         p |    0.000     0.313
        ll |    0.863    -0.044
        ul |    1.044     0.137

Specified values of covariates

           |    price    weight
 ----------+-------------------
   Current |     6165      3019


. ado dir spost13_ado

[19] package spost13_ado from https://jslsoc.sitehost.iu.edu/stata
      Distribution-date: 19Jul2020

.

But I must be honest. I tried about ten different versions of the mtable command and all of them encountered various errors regarding the pr() option. I am as certain as I can be that even your version initially encountered an error, but I now am no longer able to induce the error no matter what changes I make to the mtable command.

At a minimum try the above example and see if get an error or not.

[Richard Williams]

William's code worked fine for me the first time,

Haseok may want to try his problem on a different machine, if possible. I wonder if his machine is corrupted somehow.

Or, if he is allowed to share, use dataex to create a small extract of his data and share it as well as the code that will replicate the problem. Or, use publicly available data sets that will replicate the problem.

As it is, I don't think we have enough information to see what is causing the issue.

As a sidelight, the location for spost13_ado has changed. I actually had it listed twice in my list of downloaded files:

. ado dir spost13_ado

[277] package spost13_ado from http://www.indiana.edu/~jslsoc/stata
      Distribution-date: 05Apr2019

[353] package spost13_ado from https://jslsoc.sitehost.iu.edu/stata
      Distribution-date: 19Jul2020

I'm not sure, if you download it from the old site, adoupate would still update it for you, or if pieces remaining from the original installation could cause problems. To be safe, I gave the command

. ado uninstall [277]

package spost13_ado from http://www.indiana.edu/~jslsoc/stata
      Distribution-date: 05Apr2019

(package uninstalled)