option over() not allowed after margins, post

[Giuseppe Polito]

I can run:

margins, over(my_dummy_variable) post

the first time, and get the results in e() in order to t-test for the significance of margin differences.
But I cannot run it a second time.
If I run it a second time, I get:

option over() not allowed
r(198);

[Leonardo Guizzetti]

-post-ing results has the effect of clearing the previous estimation results, namely those from your model. You will need to re-run the model again, or else save and later restore the results in the following way.

See more at -help estimates store-.

// run your model here
est sto MyModel // save the model results for later use

margins ...., post  // do something with the model results

est restore MyModel  // load the model results back

[Giuseppe Polito]

-post-ing results has the effect of clearing the previous estimation results, namely those from your model. You will need to re-run the model again, or else save and later restore the results in the following way.

See more at -help estimates store-.

// run your model here
est sto MyModel // save the model results for later use

margins ...., post // do something with the model results

est restore MyModel // load the model results back

That was it.

Thank you so much!