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
> -------------------
> thomas:999 paterno$ R --vanilla
>
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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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