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statistics-skewed data
参考文献:
http://www.statisticshowto.com/skewed-distribution/
left/negatively-skewed distributions :
- boxplot:The left whisker will also be longer than the right whisker.
right/positively-skewed distributions
- the right whisker will be longer.
注意:median未必一定在mean和mode之间
对于too skewed的数据,如果需要进行参数检验(比如ANOVA),就需要用log变换,让它没那么skewed。
何时这么做??
- Your data is highly skewed to the right (i.e. in the positive direction).
- The residual’s standard deviation is proportional to your fitted values
- The data’s relationship is close to exponential.
- You think the residuals reflect multiplicative errors that have accumulated during each step of the computation.
statistics-skewed data
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