[R] boxcox.fit error

From: Alexys Herleym Rodriguez Avellaneda <alexyshr_at_gmail.com>
Date: Fri, 07 Mar 2008 10:39:34 -0500


Hi,

Thakns all for your help

I am doing the next in my dataframe tabla, column pend1, because the Lilliefors (Kolmogorov-Smirnov) test give me a pvalue < alfa. (data no normal distribution). I need do a transformation with box-cox or other:

> bc <- boxcox.fit(tabla$pend1)

R send to me:
Error in boxcox.fit(tabla$pend1) : Transformation requires positive data

The summary for my data is:
> summary(tabla$pend1)

   Min. 1st Qu. Median Mean 3rd Qu. Max.     0.0 12.8 19.8 20.2 27.2 57.9
> length(tabla$pend1)

[1] 4408

Someone can help me?. What is the error?

Thanks

Alexys H



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