[R] Help on calculating spearman rank correlation for a data frame with conditions

[R. Michael Weylandt]

On Tue, Aug 28, 2012 at 9:01 PM, Yi <liuyi.feier at gmail.com> wrote:
> Dear all,
>
> Suppose my data frame is as follows:
>
> id  price  distance
> 1   2     4
> 1   3    5
> ...
> 2  4   8
> 2  5   9
> ...
> n  3   7
> n   8  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.
>
> Then I tried to use
> apply(data,list='id',cor(price , distance , method = "spearman"))
> to
>

You seem to have been cut off mid-thought,  but I'm guessing you want
something more like:

tapply(data, data$id, function(x), cor(x$price, x$distance, method =
"spearman"))

Cheers,
Michael

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