[R] help on compare two ranks

Uwe Ligges ligges at statistik.tu-dortmund.de
Fri Apr 15 17:45:51 CEST 2011

Sounds like homework. Anyway, lookup rank correlations (Spearman, 
Kendall, etc.) and correpsonding tests.

Uwe Ligges

On 14.04.2011 17:00, Baoqiang Cao wrote:
> Hi,
> I have to one set of inputs and their observed true values of each
> input. Now I have a model takes the input and predict a value. I only
> consider the ranks based on either the observed true values or the
> predicted values. My question is how do I compare this two rank in R?
> That is, how close the rank from prediction to the rank from true
> observations?
> x_1: y_1, p_1,
> x_2: y_2, p_2,
> ...
> x_m: y_m, p_m,
> R_y is the ranking based on {y_1, y_2,..,y_m}. R_p is the ranking from
> {p_1, p_2, ..., p_m}. How do I know in R how good/bad R_p is given
> R_y?
> I searched r-help and got some clue of using wilcox.test but still a
> bit confused of how to compare the two ranking against the true
> ranking. Any advice will be highly appreciated. I apologize if this is
> a too statistics question.
> Thanks in advance.
> Baoqiang
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