topic Re: Adjusting for a variable in Logistic regression in SAS Programming

Adjusting for a variable in linear regression

CathyVI — Sun, 20 Jun 2021 15:51:49 GMT

What does it mean if I'm asked to adjust for a variable?

Using sashelp.heart dataset, i want to run a linear regression of weight as my dependent variable and height as my independent variable adjusting for AgeAtStart.

Is this code correct?

proc reg data=sashelp.heart;

model weight =height AgeAtStart;

run;

If I want to add more independent variable like diastolic, systolic, and still adjusting for AgeAtStart how will I arrange the code? Is this correct?

proc reg data=sashelp.heart;

model weight =height diastolic systolic AgeAtStart;

run;

Re: Adjusting for a variable in Logistic regression

tarheel13 — Sun, 20 Jun 2021 15:45:35 GMT

Proc reg is for linear regression so it does not look correct since you saw you want logistic regression. Read this: https://stats.idre.ucla.edu/sas/dae/logit-regression/

Re: Adjusting for a variable in Logistic regression

CathyVI — Sun, 20 Jun 2021 15:52:47 GMT

Sorry I meant to say Linear regression

Re: Adjusting for a variable in Logistic regression

tarheel13 — Sun, 20 Jun 2021 15:53:55 GMT

Okay if it’s linear then your code is fine.

Re: Adjusting for a variable in linear regression

Ksharp — Mon, 21 Jun 2021 12:31:26 GMT

I don't understand your question. Do you mean constant coefficient of AgeAtStart be 1 ?
maybe @Rick_SAS know something more .

Re: Adjusting for a variable in linear regression

Rick_SAS — Mon, 21 Jun 2021 12:52:19 GMT

As you say, "adjusting for a variable" (or "controlling for a variable") is related to including that variable in an appropriate regression model. For a good explanation and example, see regression - Explain model adjustment, in plain English - Cross Validated (stackexchange.com)