Absolute error and mean absolute error (Absolute error magnitude of each reading from mean; mean)

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Absolute error magnitude of each reading from mean; mean absolute error averages those magnitudes.

What each symbol means

SymbolWhat it stands for
nNumber of observations
Δx_iAbsolute deviation of ith reading from mean
x_meanArithmetic mean of readings

When to use this

For single measurement vs true value, absolute error is |measured − true| when true is known.