[R-sig-eco] Testing "order" on predicted data

[Corrado]

Dear all,

I have a strange situation:

1) I have some data that are associated with "sites"
2) I have two models that predict the data on the "sites"
3) I would like to understand which of the models predicts the order of the 
data better. In other words, I am not interested in the models predicting the 
values exactly, but only in predicting values that are in the same order 
(smaller to bigger).

What is the best test?

PS: Does that make sense?

Best,
-- 
Corrado Topi

Global Climate Change & Biodiversity Indicators
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk