Neil J. McRae said:
> Giles, interesting correlation ??? would be very interesting to find out if 
> this was the cause. I???d find that quite surprising if it was the case but 
> very interesting. 5% of the population might fit into this bracket but I???d 
> expect them to be shared between all the operators perhaps making the size of 
> the population on each operator quite small, and not sure large enough to 
> make such something noticeable.

Actually, it should be about 5% of the population on each operator,
assuming there's nothing (such as geographical distribution) to disturb the
relationship. Yes, they have to be shared out, but so does the population!

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