- (outliers sequence #:coef)procedure
Identifies outliers using Tukey's method. Values beyond #:coef times the IQR from Q1/Q3 are considered outliers. Returns two values: a list of outlier values and a list of non-outlier values (clean sequence). The #:coef parameter defaults to 1.5 (standard outliers); use 3.0 for extreme outliers.
> (outliers '(10 12 14 15 16 18 20 100) #:coef 1.5) (100) (10 12 14 15 16 18 20) ; 2 values