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Skewness Rsk is a measure of the asymmetry of the amplitude den­sity curve. Negative skewness indi­cates a surface with good bearing properties.


Kurtosis Rku is a measure of the steepness of the amplitude den­sity curve. For profile values with a normal distribution, Rku = 3.


The skewness and kurtosis param­eters are heavily influenced by indi­vidual peaks and valleys, which reduces their practical significance.