Referring to an element of a coefficient matrix after margins cmd

[Bartek Woda]

Hello everyone,

I have the following problem: I estimate a logit regression with a number of covariates. I then obtain fitted values at several values of a covariate of interest using the "margins" command. For example:

webuse margex, clear
logit outcome i.group distance
margins, at(distance=(100 200)) post

Now I would like to refer to the estimated margins to use them in further calculations (so something like _b[distance=100], _b[distance=200]). What is the syntax to do this?

Thank you!

[Devra Golbe]

Does this do what you need?

ereturn list
matrix list  e(b)
matrix b=e(b)
scalar b100=b[1,1]
scalar b200=b[1,2]
display b100 b200

Devra

[Bartek Woda]

Yes, this works, but I was wondering if there was any shorthand syntax to do that, as with regression coefficients.

[Devra Golbe]

The first two lines of my code and the last are purely illustrative. I would also be curious to know if there's a way to condense the middle three!

[daniel klein]

Since you post margins results you can

display _b[1._at]

Also see the el() function.

display el(e(b), 1, 1)

Whether any of these methods is more convenient, I do not know.

Best
Daniel

[Bartek Woda]

Since you post margins results you can

display _b[1._at]

Also see the el() function.

display el(e(b), 1, 1)

Whether any of these methods is more convenient, I do not know.

Best
Daniel

The first one is exactly what I had in mind. Thanks!