2
$\begingroup$

I mistyped in stata "logistic a" where a is a binary variable and to my surprise it actually ran.

What is a logistic regression doing when it's running without any independent variables?

enter image description here

Improve this question
$\endgroup$
3
  • 5
    $\begingroup$ It might be just fitting the null model (intercept only, log-odds of being in the class of interest). To verify, please edit your question to show the class breakdown of your binary variable a and the output from the command you ran. $\endgroup$
    – EdM
    Commented Jan 3, 2020 at 16:50
  • 3
    $\begingroup$ Edited my answer, does this suffice? $\endgroup$
    – Paze
    Commented Jan 3, 2020 at 16:54
  • $\begingroup$ Incidentally, you can do this with regress, ologit, etc. In all cases you get an intercept only model: a heavy-handed way to characterize the mean/proportion, etc. of the dependent variable. Contrast mean a with regress a with Odds/(Odds+1) from your output above. $\endgroup$
    – Alexis
    Commented Jan 4, 2020 at 18:35

1 Answer 1

Reset to default
12
$\begingroup$

It's an intercept-only model. Stata's notation _cons is the intercept term. With no other regressors, the odds is $p/(1-p)$ where $p$ is the proportion with positive response.

Improve this answer
$\endgroup$
2
  • $\begingroup$ I understand what the intercept and the constant is, but I'm still not sure if this actually tells me anything about my variable? $\endgroup$
    – Paze
    Commented Jan 4, 2020 at 21:31
  • $\begingroup$ @Paze I have already shown you how the value of "Odds" relates to the frequency of your variable ShuntEffekt. $\endgroup$
    – AdamO
    Commented Jan 7, 2020 at 16:52

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.