Hi Jenny!

So if i understand your datafile corect you have 960 case for a year. Any
you have 43 years.. Yes?

I'm not sure you should use correlation in this situation because of the
autocorrelation of the data. There are big autocorrelation on spatial data's
like what you use, and there are also a very big autocorrelation in time
series data. I think you have to decompose your time series, and you have to
cut down, the trend (and maybe some kind of sesonality), and than for the
residuals you should do a correlation. You have to filter out the
autocorrelation on the spatial data too, some way..

And because of the above problems, don't calculate correlation for the
entierly databases!

bye,
Zoltan

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