Z-Score

Properties2

Type	Concept
Note created	Feb 17, 2025

A z-score is the number of standard deviations by which the value of a data point is above or below the mean of the whole population. An observation $x$ can therefore be computed using the mean of a sample $\overline{x}$ and its standard deviation $S$:

$$z=\frac{x-\overline{x}}{S}$$