Trying to figure out how to model a categorical predictor in your regression?
Done this code a million times but can never remember the syntax for the class statement? Want to generate exponentiated estimates and confidence intervals? We'll give examples for binary, 3 levels, 4 levels, and stratified.
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Author: Bailey DeBarmore Short post today on how to use the MEAN function in SAS 9.4. Let's get started.
It seems like every time I need to calculate a mean variable in SAS, I find myself looking up which CALL functions deal with missing values in this way, and which in that way. For example, blood pressure readings are often taken 3 times, and then we average those 3 readings together for a mean value. In some code I ran earlier this morning, I kept getting negative values in my "avg_bp" variable. What's up with that?
Author: Bailey DeBarmore
While I'm not a big fan of p values, sometimes your coauthors, reviewers, or editors ask for them. In this post I'll show you how to calculate p for trend for ordered categories, like in a Table 1, and for adjusted odds ratios or similar regression.
R users: I don't use R much, but encourage you to search for "prop.trend.test" to learn more about trend tests in R.
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September 2018
