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Calculate Mahalanobis distances for the selected TableOfReal with respect to one group in the selected Discriminant object.
See Covariance & TableOfReal: To TableOfReal (mahalanobis)....
Calculate the number of datapoints that are within the one-sigma elipses of two different groups, i.e. the number of data points that are in the overlapping area.
Suppose the group labels are ø and ʏ.
   pols50m = Create TableOfReal (Pols 1973): "no"
   Formula: ~ log10 (self)
   discriminant = To Discriminant
   selectObject: pols50m, discriminant
   t1 = To TableOfReal (mahalanobis): "\o/", "no"
   selectObject: pols50m, discriminant
   t2 = To TableOfReal (mahalanobis): "\yc", "no"
Now we count when both the t1 and t2 values are smaller than 1 (sigma):
   Copy: "tr"
   Formula: ~ object [t1] < 1 and object [t2] < 1
   Extract rows where column: 1, "equal to", 1
   no = Get number of rows"
© djmw 20170828