[R] boxcox.fit error

[Bill.Venables at csiro.au]

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

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