[Rd] Apparent bug in summaryBy (PR#13941)

[Duncan Murdoch]

paterno at fnal.gov wrote:
> Full_Name: Marc Paterno
> Version: 2.9.2
> OS: Mac OS X 10.5.8
> Submission from: (NULL) (99.53.212.55)
>
>
> summaryBy() produces incorrect results when given some data  frames. Below is a
> transcript of a session showing the result, in a data frame with 2 observations
> of 2 variables.
>   

This looks like a bug in the doBy package (or something it uses), not a 
bug in R.  I've cc'd the maintainer of that package to let him know 
about it. 

By the way, an easier way to create that dataframe is simply

tmp <- data.frame(V1=c("c", "b"), V2=c(1,2))

Duncan Murdoch

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>   
>> library(doBy)
>> tmp = read.table("moduledata_999_1.txt",header=FALSE)
>> str(tmp)
>>     
> 'data.frame':	2 obs. of  2 variables:
>  $ V1: Factor w/ 2 levels "b","c": 2 1
>  $ V2: num  1 2
>   
>> tmp
>>     
>   V1 V2
> 1  c  1
> 2  b  2
>   
>> summaryBy(V2~V1,tmp)
>>     
>   V1 V2.mean
> 1  b       1
> 2  c       2
>
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