 Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

# st: problem with Margin command and interaction graph in fixed effect logistic regression

 From Nahla Betelmal To "statalist@hsphsun2.harvard.edu" Subject st: problem with Margin command and interaction graph in fixed effect logistic regression Date Thu, 31 Oct 2013 14:29:42 +0000

```Dear Statalist members,

I am facing difficulty in getting the margins and plotting the
interaction graph in a fixed-effect logistic regression. I believe
this is due to the fact that fixed effect logistic regression does not
report an intercept. I wonder if there is a way to get around this to
produce the graph.

In the regression there is three interactions ( Dummy variable with
Continuous variable in each interaction)

Conditional (fixed-effects) logistic regression   Number of obs   =       9941

Wald chi2(34)   =     681.92

Prob > chi2     =     0.0000
Log pseudolikelihood = -3651.0306                               Pseudo
R2       =     0.1458

1220 clusters in firm)
---------------------------------------------------------------------------------------------
|               Robust
To |      Coef.   Std. Err.      z    P>|z|
[95% Conf. Interval]
----------------------------+----------------------------------------------------------------
1.DV |   .1529853   .1576329     0.97   0.332
-.1559694    .4619401
|
DVr#c.IVA |
0  |   .1643871   .0829615     1.98   0.048
.0017855    .3269886
1  |   .2475583    .091258     2.71   0.007
.068696    .4264206
|
DV#c.IVB |
0  |   .1423918   .1179659     1.21   0.227
-.088817    .3736007
1  |   .4909195   .1660735     2.96   0.003
.1654214    .8164176
|
DVr#c.IVC |
0  |   .5103285    .104731     4.87   0.000
.3050596    .7155974
1  |   .5350398   .1325409     4.04   0.000
.2752644    .7948152

I tried to get each interaction alone first, but did not work

. margins DV, at( IVA=(-1.1(0.1)1.7))
default predict option not appropriate with margins
r(322);

I tried all together

. margins OC_2year, at((mean) IVA (mean) IVB (mean) IVC)
default predict option not appropriate with margins
r(322);