👉 In statistics, a skewness is a measure of the asymmetry or non-normality of a distribution. It quantifies how much the data deviates from its mean. Skewness can be defined as an excess kurtosis value, which indicates how much the peak of the distribution is above or below the mean. Skewnesses are often used to evaluate the shape of a distribution and to identify outliers or other unusual features in a sample. They can also be used for statistical significance testing