The standard deviation is therefore calculated by taking the square root of the variance. This brings it back to the same unit of measure as the underlying data set.

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A three sigma limit is a statistical calculation in which the data are within three standard deviations from a mean. According to the empirical rule, that's 99.7% of the data.

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Definition: Standard deviation is the measure of dispersion of a set of data from its mean. It measures the absolute variability of a distribution; the higher the dispersion or variability, the ...

Skewed distributed data Figure 2 shows a right-skewed distribution. Such distributions may originate from measurements which cannot be negative, for example plasma concentration. In a right-skewed ...

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