need help to find out why no odd ratio output for some of variabls

Accepted Solution Solved
Reply
Occasional Contributor
Posts: 10
Accepted Solution

need help to find out why no odd ratio output for some of variabls

Hi There,

I have run a stepwise logistic regression analysis. One of my interested variable (TLR) made to the model, but the output did not display the odds ratio for this variable. Does anyone knows what is the problem?  Thank you so much in advance for your help!!

Here is my SAS code and i am attaching partial output.

proc logistic data=tag_only;

  title "(TAG) LR w/ABSI Covariate2 Adjusted Model1";

  class gender(ref='Male') race1(ref='Non-Hispanic White');

  model tag_cat(ref='Low') = gender race1 age absi paq180 INDFMPIR  tlf tlr /selection=stepwise clodds=wald;

  units tlr=sd absi=sd;

run; quit;


Accepted Solutions
Solution
‎04-04-2014 10:51 AM
Super User
Posts: 11,338

Re: need help to find out why no odd ratio output for some of variabls

When you use stepwise the selection of variables in the final model is controlled by an algorithm. When your variable doesn't appear in the final model it indicates the algorithm did not find that variable contributing significantly to the model.

You can add the Details option to show some results from each model considered.

Or remove the selection option for a first look at the data to see what the variable may contribute to the model.

View solution in original post


All Replies
Solution
‎04-04-2014 10:51 AM
Super User
Posts: 11,338

Re: need help to find out why no odd ratio output for some of variabls

When you use stepwise the selection of variables in the final model is controlled by an algorithm. When your variable doesn't appear in the final model it indicates the algorithm did not find that variable contributing significantly to the model.

You can add the Details option to show some results from each model considered.

Or remove the selection option for a first look at the data to see what the variable may contribute to the model.

Occasional Contributor
Posts: 10

Re: need help to find out why no odd ratio output for some of variabls

Thank you Ballardw for your explanation. Bo

🔒 This topic is solved and locked.

Need further help from the community? Please ask a new question.

Discussion stats
  • 2 replies
  • 229 views
  • 0 likes
  • 2 in conversation