Hello
I have been trying to figure out how to randomly select a number of records. I
have a column "ID" which contains 16 individuals (numbered 1-16), each
individual has a few hundred rows of GPS locations associated with it. I am
trying to select a random sample of these individuals (with all their
associated GPS locations) to run a kernel density analysis on, and need to
repeat this several hundred times for each number of individuals in a sample.
For example: I would like to be able to randomly select all the data associated
with 2 individuals (out of my 16) 100 times to run the analysis on and then
randomly select 3 individuals from my 16 individuals 100 times.... and then
randomly select 4 individuals 100 times ....and so on.
At the moment I am using:
data<-read.csv("All.csv")
x.sub<-data[data$ID %in% c(10,8),]
I have just been typing in random numbers to select individuals from my total
number of 16 for the subsampling which was ok when I just wanted 2 individuals
from my 16 but as I include more individuals in my sample this is becoming more
painstaking! So does anybody know how I can write a command so that R randomly
selects a specified number of individuals from my ID column.
If anybody can help I would really appreciate it
Many thanks
Louise Soanes
University of Liverpool
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