Ssk - Skewness

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Ssk - Skewness

Skewness measures the symmetry of the variation of a surface about its mean plane.  A Gaussian surface, having a symmetrical shape for the height distribution, has a skewness of zero.  A plateau honed surface with predominant plateau and deep valleys will tend to have a negative skew, whereas a surface comprised of disproportionate number of peaks will have positive skew.  The digital representation of this parameter is displayed below.


Equation - Ssk - Skewness


where M is the number of columns in the surface and N is the number of rows in the surface.


Equation - Ssk - Graphical Rep