topic What model is recommended if having dichotomous independent variables & continuous depend variable? in Statistical Procedures

What model is recommended if having dichotomous independent variables & continuous depend variable?

Jade_SAS — Sat, 30 Oct 2021 01:07:28 GMT

Hi All,

What statistics analysis is recommended if you have dichotomous independent variables and continuous depend variable? The depend variable values includes 0, 1 and values between 0 and 1 (the probability of an accident).

Thank you!

Thanks,

Jade

Re: What model is recommended if having dichotomous independent variables & continuous depend va

sbxkoenk — Sat, 30 Oct 2021 10:28:01 GMT

Hello,

Your dependent (=outcome) variable is not entirely continuous.
As it is a proportion, it is bounded by 0 and 1 (included). So you have a limited dependent variable.

You have to look at the distribution of the outcome.
Based on that you can decide to fit a GLMM with Poisson distribution (PROC GLIMMIX).

But the safest choice is probably a GLMM with beta regression (also with PROC GLIMMIX).

You might have to tackle some non-convergence problems, but we can look into this at a later stage (should you stumble upon non-convergence).

Good luck,
Koen

Re: What model is recommended if having dichotomous independent variables & continuous depend va

Ksharp — Sat, 30 Oct 2021 10:32:52 GMT

Possion Regression ?
http://support.sas.com/kb/24/188.html

Re: What model is recommended if having dichotomous independent variables & continuous depend va

Jade_SAS — Sat, 30 Oct 2021 23:45:27 GMT

Thank you!

If I choose another Binary dependent variable (0 &1 only, the independent variables are all dichotomous ), will logistic regression be recommended?

Re: What model is recommended if having dichotomous independent variables & continuous depend va

Ksharp — Sun, 31 Oct 2021 10:22:12 GMT

That could be done. But I would suggest to use PROC FREQ or PROC CATMOD if all the variable are 0 & 1 .

Re: What model is recommended if having dichotomous independent variables & continuous depend va

StatDave — Mon, 01 Nov 2021 14:04:23 GMT

Since your response is a proportion, if you have the numerator and denominator values for each of the proportions, then you can use the events/trials response syntax in PROC LOGISTIC and fit a logistic model. See the example in the Getting Started section of the PROC LOGISTIC documentation. If those are not available or conceptually don't exist, they you can fit a fractional logistic model or a 4- or 5-parameter logistic model as described in this note.