The average deviation is the average of the difference between the absolute values of data points and the mean.

Population Mean Deviation (MD)

Sample Mean Deviation (MD)

where

N |
= number of data values (for a population) |

n |
= number of data values (for a sample) |

xi |
= ith data value |

See Also

95% and 99% Confidence Interval for the Mean

Critical Value of K-S Statistic at 90%, 95%, and 99% Significance Level

Kolmogorov-Smirnov Goodness of Fit Statistic for Normal Distribution