About

The deviation score is the difference between two scores as :

• a value <math>X</math>
• and an other value (usually the predicted score: mean, …)

See also:

• for a sample, Spread
• for a measurement, Interval

Variation (??)

Articles Related

Example

• the mean <math>\bar{X}</math> of a distribution for the calculation of the correlation coefficient
• or a predicted variable for the calculation of a regression coefficient

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.