A classic measure of variability. The average of the absolute deviations from the variable's arithmetic mean.The average deviation is applied when: 1) the distribution of the examined feature is symmetrical or near symmetrical; 2) there are extreme values which, after rising to the square, would significantly burden the standard deviation.

• Dispersion measure
• Quartile deviation
• Coefficient of variation of average deviation

• Standard deviation
• Structural point series
• Series of distribution with class intervals
• Detailed series
• Arithmetic mean
• Coefficient of variation