> id price distance
> 1 2 4
> 1 3 5
> ...
> 2 4 8
> 2 5 9
> I would like to calculate the rank-order correlation between
> price and distance for each id.
>
> cor(price,distance,method = "spearman") calculate a
> correlation for all.
>
Try by()
#Example
d <- data.frame(g=gl(5, 10), x=rnorm(50), y=rnorm(50))
by(d[,2:3], d$g, cor, method="spearman")
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