calculates the interquartile range
Q = nan_iqr(Y) Q = nan_iqr(Y,DIM) Q = nan_iqr(HIS)
IQR along dimension DIM of sample array Y.
must be a HISTOGRAM struct as defined in HISTO2 or HISTO3.
Missing values (encoded as NaN) are ignored.
x = grand(100,100,'nor',0,1); s = nan_std(x); s_IQR = 0.7413*nan_iqr(x); efficiency = (norm(s-1)./norm(s_IQR-1)).^2 efficiency = 0.3297