Z-score
How many standard deviations the price is from its own average.
Formula
Z = (Price − mean of N) ÷ σ of N
How to read it
Beyond ±2 is a stretched reading — about 5% of observations if prices were normally distributed, which they are not.
How to use it
Mean-reversion setups: fading moves beyond ±2 in a range.
In Kereon
Charts · Superchart. Default 20, population deviation; lines at −2, 0 and +2.
Also called: z score, standard score.