Hi all,
I've spent too long in matlab land recently and seem to have forgotten
my R skillz ;-)
I'm sure I'm missing a simple way to do this...
Given a data frame
id<-rep(1:5,2)
eye<-c(rep('l',5),rep('r',5))
age<-rep(round(runif(5,0,12)),2)
response<-round(runif(10,1,10)*10)/10
response2<-sample(c('High','Low'),10,replace=TRUE)
data<-data.frame(id,eye,age,response,response2)
I want to create a new dataset averaging the response variable from both
eyes for each test.
I know there are many ways to do this but... I would also like to keep
the value of the response2 variable for the left eye.
ending up with the dataset
id age response response2
1 9 3.65 High
2 10 3.85 High
3 8 8.15 Low
4 4 4.4 Low
5 0 4.6 High
I thought something like
f<-function(x){#make my choices here}
aggregate(data,list(data$id),f)
but x only seems to contain the first column of data.
I could probably have done this manually in the time spent writing this
email.
any help appreciated,
Tom