Originally Posted by
Snow Leopard
OK, So I have just finished banging my head against a brick wall whilst counting to 100 slowly.
Now obviously I blame myself for not sending you fully detailed instructions that had been signed in triplicate, sent in, sent back, queried, lost, found, subjected to public inquiry, lost again, and finally buried in soft peat for three months and recycled as firelighters.
Deep breath:
You do a linear regression on the log of the price data.
PS - acknowledgements to Douglas Adams for borrowing a few well ordered words