We'll also need to work with an raw data file version of the subset data set. You might also want to note that the FORMAT statement tells SAS to use the SAS-provided w.d format to display an age as 44.7, say. We will learn more about the KEEP statement in Stat 481. And, the KEEP statement tells SAS which nine variables we want included in the back data set. Note that the IF statement tells SAS which ten subjects we want included in the back data set. Then, run the program and review the contents of the print procedure to familiarize yourself with the structure and contents of the subset data set called back. Then, edit the LIBNAME statement so it reflects the location where you saved the background data set. A Save dialog box will appear and allow you to save the data file to the location you choose on your computer. To do so, right-click the link and select the "Save Link As" option. In order to run the SAS programs in this lesson, you'll need to save the background data set to a directory on your computer. It will probably be helpful for you to take a peek at the background data form on which the data were collected.
For the ICDB Study, each subject was enrolled at one of seven clinical centers and was evaluated four times a year for as many as four years. Although the disease is more prevalent in women, it affects both men and women of all ages. Not surprisingly, the ICDB Study collected data on people who were diagnosed as having interstitial cystitis! The primary reason for conducting the study was that interstitial cystitis is a poorly understood condition that causes severe bladder and pelvic pain, urinary frequency, and painful urination in the absence of any identifiable cause. To do so, we will use a subset of the demographic (or "background") data collected on 638 subjects once enrolled in the National Institute of Health's Interstitial Cystitis Data Base (ICDB) Study.
#Sas 9.1 proc geodist how to
Throughout this lesson, we will investigate a number of examples that illustrate how to create different informats and formats for several different variables.
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