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per90
2001 Apr 06
1
interpolation in matrix
How would you proceed with the following problem:
I have an data frame containing a table relating raw scores on an iq test to
'decile-like' scores.
data<-data.frame(age =c( 8, 9, 10, 11, 12, 13, 25, 30, 35, 40, 45, 50,
55, 60, 65, 70),
pers90=c(33, 39, 43, 47, 50, 54, 54, 52, 50, 49,
47, 46, 43, 42, 39, 37),
perc75=c(27, 31, 37, 42, 46, 49, 49, 47, 46, 44,
42, 40, 37, 34, 31, 30),
perc50=c(21, 25, 29, 34, 39, 44, 44, 42, 39, 37,
34, 31, 29, 27, 25, 22),
pers25=c(...