Ocean Enclosures

Since 1990

Deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean. The sign of the deviation positive or negative (+ or -), reports the direction of that difference. The deviation is positive when the observed value exceeds the reference value. The magnitude of the value indicates the size of the difference.

Statistics of the distribution of deviations are used as measures of statistical dispersion.

Standard deviation is the frequently used measure of dispersion: it uses squared deviations, and has desirable properties, but is not robust. Average absolute deviation, is the sum of absolute values of the deviations divided by the number of observations. Median absolute deviation is a robust statistic which uses the median, not the mean, of absolute deviations. Maximum absolute deviation is a highly non-robust measure, which uses the maximum absolute deviation.

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Deviation Meter (+ - 20%)

Deviation Meter