The %TPLOT macro creates a triangular plot that graphically displays genetic marker test results. The plot has colors and shapes representing -value ranges for tests of the following quantities: linkage disequilibrium between pairs of markers, Hardy-Weinberg equilibrium (HWE) for individual markers, and associations between markers and a dichotomous trait (such as disease status). This is a convenient way of combining information contained in output data sets from two separate SAS/Genetics procedures and summarizing it in an easily interpretable plot. Thus, insights can be gleaned by simply studying a plot rather than having to search through many rows of data or writing code to attempt to summarize the results.

The %TPLOT macro is a part of the SAS Autocall library, and it is automatically available for use in your SAS program provided that the SAS system option MAUTOSOURCE is in effect. For more information about autocall libraries, see SAS Macro Language: Reference, Version 8 (2000).