RANGE calculates the range of Y 
  Missing values (encoded as NaN) are ignored. 

  Q = range(Y)
  Q = range(Y,DIM)
     returns the range along dimension DIM of sample array Y.

  Q = range(HIS)
     returns the RANGE from the histogram HIS.
     HIS must be a HISTOGRAM struct as defined in HISTO2 or HISTO3.

 see also: IQR, MAD, HISTO2, HISTO3, PERCENTILE, QUANTILE

Package: nan