in reply to Re^3: creating and managing many hashes
in thread creating and managing many hashes

Products : 2008 Dates : 530 Records : 867434 Run Time : 57 s

Thanks, poj. I'm new to hashes. The snippet of code you've provided, calculates the mean and std dev, but not the pair correlation. Am I correct in assuming that this bit will need to be built in and consequently the run times would look very different to what it does currently? Also, my data set unfortunately does not prices and inventories for all products on all days. I'd appreciate any advice you can provide. Thank you once again.