kurtosis

 KURTOSIS estimates the kurtosis

 y = kurtosis(x,DIM)
   calculates kurtosis of x in dimension DIM

 DIM    dimension
    1: STATS of columns
    2: STATS of rows
    default or []: first DIMENSION, with more than 1 element

 features:
 - can deal with NaN's (missing values)
 - dimension argument 
 - compatible to Matlab and Octave

 see also: SUMSKIPNAN, VAR, STD, VAR, SKEWNESS, MOMENT, STATISTIC,
    IMPLICIT_SKIP_NAN

 REFERENCE(S):
 http://mathworld.wolfram.com/