June 2025
Intermediate to advanced
515 pages
17h 5m
English
Dispersion parameters describe the distance of individual measurement values from their mean value. To ensure process quality, the dispersion of the population and individual samples should be as low as possible. Statistics uses two measures to quantify dispersion: the span and the standard deviation.
The span R is simply calculated from the difference between the largest and the smallest measurement value of a series of measurements, as in the following:
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While this measure is easy to calculate, for more detailed statistical studies, this approach is not recommended because it is quite sensitive to outliers.
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