Maxima Function
quartile_skewness (list)
quartile_skewness(matrix)
The quartile skewness coefficient, defined as
c - 2 c + c 3/4 1/2 1/4 -------------------- c - c 3/4 1/4
c_p is the p-quantile of sample list.
Example:
(%i1) load (descriptive)$ (%i2) load (numericalio)$ (%i3) s1 : read_list (file_search ("pidigits.data"))$ (%i4) quartile_skewness (s1), numer; (%o4) .04761904761904762 (%i5) s2 : read_matrix (file_search ("wind.data"))$ (%i6) quartile_skewness (s2); (%o6) [- 0.0408542246982353, .1467025572005382, 0.0336239103362392, .03780068728522298, 0.210526315789474]