Some measures of skewness are the third central moments the mean minus the median, arid measures in terms of percentiles. The signs of these measures are analysed for two asymmetric generalisations of Tukey's lambda distribution. The results expand and explain some results of Ramberg et al.1979, and illustrate the problem of choosing an appropriate measure of skewness.
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H.L. MacGiliivray (1982) studied this question.
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