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Standard Deviation

The Standard Deviation is a measure of the dispersion of a data set. In general statistics it is usually calculated using the Root Mean Square Error (RMSE) method:

In Statistical Process Control and Measurement Systems Analysis it is often estimated using the Range Method.

The standard deviation is the square root of the variance. The standard deviation is often preferred because it has the same units as the characteristic being measured and so is proportionate to the characteristic.

 Analytical and descriptive statistics are covered in the MiC Quality online course Primer in Statistics. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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