Use K-Means clustering to reduce marker number Check this option to use K-Means clustering via SAS PROC FASTCLUS to reduce the number of markers. This approach does not use knowledge of the recombination between markers. Note : This option is intended to be used for speeding up the computations when there are many markers in the input data set. When you choose to use this option, only a subset of representative markers are used in the linkage map analysis. To Specify This Option: Click within the check box.