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Logistic Regression

I am trying to do a multivariate logistic regression and I wanted to know how do we chose a baseline (referent) to compare the odds to.

For example, I am comparing different medications, and I want to choose the referent and then have the odds come out comparing it

AnalyticsRe: Logistic RegressionHi,
If you use the Fit Model > Nominal Logistic platform and select the Odds Ratio from the output window (red triangle at the top left), JMP will generate the odds ratios for all possible combinations of pairwise values of your nominal variable including their inverse. Hence, you do not need to nominate a specific treatment / drug / state to obtain the Odds Ratio for a specific combination.
Does that make sense or did I misinterpret your question?
Best,
TSRe: Logistic Regression

Thank you for your message, but when I use SPSS, I am able to use a referent. 

Let me give you an example

If we are looking at the dependent variable that has 4 options for example, how can I select the referent from these 4.

For example, let us consider these 4 options as Drug A, B, C, D.  Indep variable let us say adverse event (yes/no). Can we look at odds ratio for B, C, D in reference to A

Like Drug B has 10 times odds of having an adverse reaction compared to drug A. 

 

Let me know what you think