June 2025
Intermediate to advanced
515 pages
17h 5m
English
Content preview from Python For Engineering and Scientific Computing
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9.6 Skew
For SPC, you must know whether a measurement series is normally distributed, more or less. This criterion can be checked with the statistical measure of skewness. Skew is a statistical measure between –1 and +1 that describes whether and how strongly a frequency distribution is skewed to the right or to the left. If the frequency distribution is skewed to the right, it is called right skewed. The dimension number S is then negative. If the frequency distribution is skewed to the left, it is called left skewed. The dimension number S is then positive. The smaller S is, the more symmetrical the frequency distribution is. For the normal distribution, S = 0. Karl Pearson (1895–1980) gave a simple rule of thumb to describe the deviation ...
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