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f2f3
2009 Mar 22
1
data frame to array
Aloha all,
I have a data frame with 4 columns. The first three are factors (f1,
f2, f3) and the fourth is numeric. I'd like to explore these data
using median polish. To do that I plan to use medpolish() on the
matrix[f1,f2xf3], then medpolish on the resulting matrix[f2,f3]. This
approach is described by Cook on page 141 of Exploring Data Tables,
Trends, and Shapes.
split() gets me close to where I want to be, but results in a list,
rather than a matrix. How do I construct the matrix[f1,f2xf3] from my
data fra...