# Statistics - Deviation Score (for one observation)

## 1 - About

The deviation score is the difference between two scores as :

• a value $X$
• and an other value (usually the predicted score: mean, …)

See also:

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## 3 - Example

• the mean $\bar{X}$ of a distribution for the calculation of the correlation coefficient
• or a predicted variable for the calculation of a regression coefficient

## 4 - Deviation Form

By putting all scores of a variable in a deviation form, the average for this variable will be equal to zero. It's called centering.

To center means to put in deviation form.