Robin -
Does
tapply(value,id,sum)
do what you want?
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Wed, 2 Feb 2011, Robin Jeffries wrote:
Hello there,
I'm still struggling with the *apply commands. I have 5 people with id's
from 10 to 14. I have varying amounts (nrep) of repeated outcome (value)
measured on them.
nrep <- 1:5
id <- rep(c("p1", "p2", "p3", "p4", "p5"), nrep)
value <- rnorm(length(id))
I want to create a new vector that contains the sum of the values per
person.
subject.value[1] <- value[1] # 1 measurement
subject.value[2] <- sum(value[2:3]) # the next 2 measurements
...
subject.value[5] <- sum(value[11:15]) # the next 5 measurements
I'd imagine it'll be some sort of *apply(value, nrep, sum) but I can't seem
to land on the right format.
Can someone give me a heads up as to what the correct syntax and function
is?
Danke,
Robin Jeffries
MS, DrPH Candidate
Department of Biostatistics
UCLA
530-624-0428
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