I'm a researcher who often has to do my own statistics for various
reasons so apologies if this and two other questions are pretty low
level.
I've just found the apply function and the array objects brilliant for
speedy work on some 3 mode rating data. The data had to be
imported from an SPSS data set so my first silly question is how I
should extract a matrix from a data frame. I wanted some
contiguous columns in the frame to become a matrix. I ended up
using c to concatenate the variables, listed laboriously, after
attaching the frame. I must be missing something in the
subscripting of data frames musn't I? Would someone tell me or
point me to right place?
TIA,
Chris
Chris Evans <chris@psyctc.org>
Consultant Psychiatrist in Psychotherapy,
Rampton Hospital; Associate R&D Director,
Tavistock & Portman NHS Trust;
Hon. SL Institute of Psychiatry
*** My views are my own and not representative
of those institutions ***
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