Apologies for long post! I'm new to R and have been working hard to improve my command of the language. I stumbled across this interesting project on modelling football results: http://www1.maths.leeds.ac.uk/~voss/projects/2010-sports/JamesGardner.pdf
I keep running into problems when I run the code to Simulate a Full Season (first mentioned page 36, appendix page 59):
Games <- function(parameters)
{
teams <- rownames(parameters)
P <- parameters$teams
home <- parameters$home
n <- length(teams)
C <- data.frame()
row <- 1
for (i in 1:n) {
for (j in 1:n) {
if (i != j) {
C[row,1] <- teams[i]
C[row,2] <- teams[j]
C[row,3] <- rpois(1, exp(P[i,]$Attack - P[j,]$Defence + home))
C[row,4] <- rpois(1, exp(P[j,]$Attack - P[i,]$Defence))
row <- row + 1
}
}
}
return(C)
}
Games(TeamParameters)
The response I get is
Error in `*tmp*`[[j]] : subscript out of bounds
When I attempt a traceback(), this is what I get:
3: `[<-.data.frame`(`*tmp*`, row, 1, value = NULL) at #11
2: `[<-`(`*tmp*`, row, 1, value = NULL) at #11
1: Games(TeamParameters)
I don't really understand what the error means and I would appreciate any help. Once again, apologies for the long post but I'm really interested in this project and would love to learn what the problem is!