MathLiveStandard score formula
Converts a raw score into the number of standard deviations it lies above or below the mean. It is used to compare values from different distributions on a common scale.
z = \frac{x - \mu}{\sigma}What the symbols mean
| standard score (z-score), dimensionless | |
| raw score or observed value | |
| mean of the distribution | |
| standard deviation of the distribution |
About this formula
- FieldStatistics
- TopicDescriptive statistics
- LevelHigh school
- Also calledz-score, z score, standardized score, standardization formula, number of standard deviations from the mean, z value formula
- SourceWikidata Q1050272
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