Filter to Include Markers

The Filter to Include Markers field is an optional parameter that enables you to subset the markers before analysis based on values of variables in the annotation data set. Only those markers that meet all of the specified conditions, in both the annotation data set and the corresponding marker columns in the input data set, are included.

Note: Unless you want to analyze a small subset out of the entire set of SNPs only, it is better to analyze the whole data set first and then filter the results.

For example, to filter only diseased individuals from a data set containing a mixed population of diseased (sick) and healthy (healthy) individuals (as indicated in a column named DiseaseStatus), you could use the following simple WHERE expression:

WHERE DiseaseStatus = ‘sick’

Note: the word where has already been entered for you.

For more information about using filter fields, see The SAS WHERE Expression.