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statistics-skewed data

时间:2017-05-26 10:52:07      阅读:248      评论:0      收藏:0      [点我收藏+]

标签:sid   box   err   变换   margin   resid   plot   ext   pos   

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.

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right/positively-skewed distributions

  •  the right whisker will be longer.

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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

标签:sid   box   err   变换   margin   resid   plot   ext   pos   

原文地址:http://www.cnblogs.com/pxy7896/p/6906055.html

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