Calculus was bad enough.
If you can find anything of use in the data, feel free to run with it and report back. I wonder if there is any decent state by state data for SAD? That might be interesting.....
Quote:
Originally Posted by johnt
Thanks for the data Rick.
Using this data directly gives a correlation of almost 0.25, from which (taking the square) it's reasonable to estimate 6% of the variance in PD rates is due to factors linked with latitude. Even then we are not talking causality.
The analysis would be improved if:
- we weighted the data by population;
- used the population centre of gravity for each state;
- used UV data.
John
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