[R] by Function Result Factor Levels

[Dario Strbenac]

Good day,

How is it possible to get a data.frame of factor levels used for obtaining each element of the result of the by function ? For example,

result <- by(warpbreaks[, 1],   warpbreaks[, -1], summary)
> result
wool: A
tension: L
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
  25.00   26.00   51.00   44.56   54.00   70.00 
 ...

I'd like to obtain a data.frame of the two columns, wool and tension, specifying the level of each factor that corresponds to each element of result.

--------------------------------------
Dario Strbenac
PhD Student
University of Sydney
Camperdown NSW 2050
Australia