topic Re: determining which model to use in SAS Procedures

determining which model to use

GreggB — Fri, 09 Dec 2016 17:38:16 GMT

I want to create a model to examine the relationship between 7 independent variables and 1 dependent variable.

The dep var is EverRetained. Values are Y/N.

The independent vars are gender (M/F), lunchstatus (F,R,P), GTstatus (Y/N), IEPstatus (Y/N), 504status (Y/N), LEPstatus (Y/N) and RR (Y/N).

I know the type of variables determine how I should proceed but I'm sure if a regression model is appropriate. I conducted a chi square comparing the dependent var to each indep var separately. 5 of the 7 tests returned a p-value less than 0.05

Re: determining which model to use

SteveDenham — Fri, 09 Dec 2016 17:47:10 GMT

A first approach that ignores any interactions would look like:

proc logistic data=yourdata;
class gender lunchstatus gtstatus iepstatus 504status rr;
model everretained(event='y') = gender lunchstatus gtstatus iepstatus 504status rr/clodds=both;
run;

However, I am sure that interactions between the independent variables exist, and should be modeled. Use your prior knowledge about which interactions are of interest.

Steve Denham

Re: determining which model to use

GreggB — Fri, 09 Dec 2016 19:16:42 GMT

Ok, now I'm looking for the part of the output (odds ratios?) so that I can conclude something like "males are 1.5 times more likely to be retained than females."

Re: determining which model to use

SteveDenham — Mon, 12 Dec 2016 15:55:40 GMT

That would come from the odds ratios, yes.

Steve Denham