topic Re: Include multiple independent variable in Statistical Procedures

Include multiple independent variable

HM3 — Fri, 10 Jun 2016 11:04:54 GMT

I want to do a logistic regression where there are many indepedent varables. How to

write them all varaibles ?
write a subset of all the variables?
How to know which variables are imp for my calculations?
Can VIF be done in logistic regression ?

Pl guide.

Regards

Re: Include multiple independent variable

Reeza — Fri, 10 Jun 2016 16:24:25 GMT

RE 1/2

To list multiple or select variables you can use variable lists.

Read the documentation that illustrates how you can reference multiple variables at once.

http://support.sas.com/documentation/cdl/en/lrcon/68089/HTML/default/viewer.htm#p0wphcpsfgx6o7n1sjtqzizp1n39.htm

RE 3

Look at the P-Value along with effect size to determine if a variable is significant

RE 4

I don't know if it does, but you can use PROC REG to calculate VIF first if required.

Re: Include multiple independent variable

Ksharp — Sat, 11 Jun 2016 06:37:13 GMT

How to write them all varaibles ? Use variable list method : model y=FirstVariable -- LastVariable; write a subset of all the variables? Ditto. How to know which variables are imp for my calculations? Check ANOVA Table and ODDS Ratio. The biggest ODDS Ratio should be the most important variable. Can VIF be done in logistic regression ? No. You can't . But you can use SELECTION=STEPWISE to pick up the best sub-model.

Re: Include multiple independent variable

Ksharp — Sat, 11 Jun 2016 06:45:39 GMT

How to write them all varaibles ?
 Use variable list method : model y=FirstVariable -- LastVariable; 

write a subset of all the variables? 
Ditto. 

How to know which variables are imp for my calculations?
 Check ANOVA Table and ODDS Ratio. 
The biggest ODDS Ratio should be the most important variable. 


Can VIF be done in logistic regression ? 
No. You can't . But you can use SELECTION=STEPWISE to pick up the best sub-model.