Measurement of how much a sample diverges from the mean value, represented by the letter $σ$ (sigma).

It tells you how concentrated the data is around the mean or, said differently, how much variability you’ve got in your set.

Measurement of how much a sample diverges from the mean value, represented by the letter $σ$ (sigma).

It tells you how concentrated the data is around the mean or, said differently, how much variability you’ve got in your set.