IQR calculates the interquartile range Missing values (encoded as NaN) are ignored. Q = iqr(Y) Q = iqr(Y,DIM) returns the IQR along dimension DIM of sample array Y. Q = iqr(HIS) returns the IQR from the histogram HIS. HIS must be a HISTOGRAM struct as defined in HISTO2 or HISTO3. see also: MAD, RANGE, HISTO2, HISTO3, PERCENTILE, QUANTILE