As the error message says: the transformation requires positive data Your data has a minimum value at zero. That means it is merely non-negative. Positive means all the values must be greater than zero. Strictly. -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Alexys Herleym Rodriguez Avellaneda Sent: Saturday, 8 March 2008 1:40 AM To: r-help at r-project.org Subject: [R] boxcox.fit error 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 ______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.