Apparent bug in summaryBy (PR#13941)
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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