[R] change matrix based on look-up value from table
Jon Erik Ween
jween at klaru-baycrest.on.ca
Wed Dec 8 20:21:11 CET 2010
I have a large dataset where I need to recompute a value in each row based
on z-sores from another look-up table. The look-up table is arranged by raw
score in the first column and age in the first row, eg:
20 30 40
1 .3 .5 .7
2 .2 .3 .4
3 .1 .4 .7
the main matrix will have ages and raw scores and I need to select the
appropriate value from the look-up table. Unfortunately, the distribution of
the look-up does not fit a linear model, so I can't compute from a formula.
Any suggestions would be appreciated.
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