topic Re: Proc Surveylogistic giving opposite results in New SAS User

Proc Surveylogistic giving opposite results

dfarid — Mon, 29 Jul 2019 13:49:47 GMT

Hello,

I am having opposite odds ration results when I use the proc surveylogistic than the proc logistics. I am not understanding why. I tried proc logistic with descending option and the results are opposite to the surveylogistic one/ My outcome is binary.

this is the code:

proc surveylogistic data=doit;

class age sex income marital immigrant/ param=ref;

model immigrant (event="immigrant")= age sex income marital;

stratum province ;

weight weights;

run;

Thank you for the help.

Re: Proc Surveylogistic giving opposite results

PaigeMiller — Mon, 29 Jul 2019 14:05:06 GMT

Show us the PROC LOGISTIC code.

Specifically, what are you using for the EVENT= option in PROC LOGISTIC?

How are you handling the stratification in PROC LOGISTIC?

Re: Proc Surveylogistic giving opposite results

dfarid — Mon, 29 Jul 2019 13:58:25 GMT

Hi Paige,

Proc logistic data=doit descending simple;

class....../param=ref;

model immigrant (event="immigrant")=......;

run;

Re: Proc Surveylogistic giving opposite results

PaigeMiller — Mon, 29 Jul 2019 14:07:00 GMT

So in PROC LOGISTIC, you have no WEIGHT statement like you do in PROC SURVEYLOGISTIC, and you also are not handling the stratification in PROC LOGISTIC.

So, I don't see any reason to expect the odds ratios to be the same.

Re: Proc Surveylogistic giving opposite results

dfarid — Mon, 29 Jul 2019 14:08:29 GMT

Yes I understand but not 1/odds.

It is completely the opposite across all variables.

Re: Proc Surveylogistic giving opposite results

PaigeMiller — Mon, 29 Jul 2019 17:44:42 GMT

I'll stick with my previous answer.

If PROC SURVEYLOGISTIC uses weights and stratification, and PROC LOGISTIC does not, the highly weighted data in PROC SURVEYLOGISTIC could have very low weights in PROC LOGISTIC; and so on.

Re: Proc Surveylogistic giving opposite results

Ksharp — Tue, 30 Jul 2019 12:45:29 GMT

model immigrant (event="NOimmigrant")

Re: Proc Surveylogistic giving opposite results

dfarid — Tue, 30 Jul 2019 15:18:38 GMT

I have included the glogit option and it gave me the right results. I am not sure why though. Very confusing.

Re: Proc Surveylogistic giving opposite results

Ksharp — Wed, 31 Jul 2019 11:14:38 GMT

I mean using another LEVEL of Y in your event= option .