Question #138983

Why the standard deviation is the better measure of variability?

Expert's answer

- It takes into account all values in a series and does not ignore any item, unlike in quartiles, percentiles, range, median, etc
- It follows the algebraic principles and does not ignore negative values, unlike the mean deviation
- It can be used for higher statistical analysis like skewness and regression
- It enables us to determine the reliability of means of two or more series, when they exhibit similar means
- It is unambiguous, since it is rigidly defined
- It is not greatly affected by flactuations
- It is possible to calculate combined standard deviation of two groups. This is not possible with any other measure of variability

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