search for: ol100

...ot;RowID". The second column contains the "Variable" of interest. The remaining 100 columns ("Overlap1" ... "Overlap100") each contain a row ID that overlaps this row (but if this row overlaps fewer than 100 other rows then the remainder of the columns "OL1...OL100" contain NA). Here's the problem: I need to select the subset of 500 independent rows that maximizes the mean and minimizes the stdev of "Variable". Clearly this requires iterative selection and comparison of rows, because each newly-selected row must be compared to rows alread...