Skewness Formula Mean Median. A positive measure of skewness indicates right skewness such as figure. The skewness can be calculated from the following formula.
Notice that the green vertical line is the mean and the blue one is the median. If the skewness is negative then the distribution is skewed left as in figure. Again the mean reflects the skewing the most.
Let s see how we can calculate the skewness by applying the formula.
The mean is 6 3 the median is 6 5 and the mode is seven. Skew 3 mean median standard deviation. Mathematically the skewness formula is represented as skewness ni xi x 3 n 1 σ3. The calculation of the skewness equation is done on the basis of the mean of the distribution the number of variables and the standard deviation of the distribution.
