search for: n1011015

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2010 Jan 11
3
Problem about Box-Cox transformation (topic in html form)
Hi: Recently, I want to perform a transformation on my data to make it more normal, meanwhile the order statistics is unchanged. So I decided to use a box-cox transformation. below is the qq-plot of the original data http://n4.nabble.com/file/n1011015/start%2Bvalue%2Bproblem%2B02.jpeg Note that the min of my data is -1099, so I add a fix value 1200 to the original sample. I choose the "box.cox.powers" function in package 'car'. Here is the result: > box.cox.powers(na.exclude(c888.dl.ma080+1200)) Box-Cox Transformation to N...