From the course: SAS Essential Training: 2 Regression Analysis for Healthcare Research
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Strategically collapsing categories - SAS Tutorial
From the course: SAS Essential Training: 2 Regression Analysis for Healthcare Research
Strategically collapsing categories
- [Instructor] You'll notice that in the first course in this series, I just had you jump in and make the analytic data set documented in the data dictionary. Now, I'm going to step back and talk to you about how I make decisions to strategically collapse some of the categories that we ended up working with when we recoded our grouping variables. In the last movie, we looked more closely at using indicator variables for the different level of EDUCA, or the highest level of education variable. You might have wondered how I decided to group these particular categories together. First, let me say that I'm lucky because I'm using a very popular data set, the BRFSS. Other people use it a lot and publish health reports, so I can see what they do when they collapse categories. I've noticed that not only the BRFSS, but other health data analysis tends to group levels 1 through 4 together. Although I have seen authors separate the levels if only focusing on that group, the way we only focus on…
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