Twee standaarddeviaties voor een scheve verdeling?
article
The standard deviation of a body dimension is often used to estimate percentile values. When the measure is not normally distributed but askew, as for instance in many circumference measures of the human body, it is possible to obtain large deviations between estimated and actual values, especially for extreme percentiles. This may lead to substantial errors, for instance in applications for the clothing industry. Therefore it is important to make better percentile estimates. We took body weight as an example for this study. This skewed distribution was divided in two parts (mirrored around the median, each distribution with its own standard deviation). Use of the standard deviations of these two distributions instead of that of the original distribution diminished the mean error in the estimation of the percentiles from 6.1% to 1.1%.
TNO Identifier
12683
Source
Tijdschrift voor ergonomie, 29(4), pp. 4-10.
Pages
4-10