Originally Posted by sirbruce
However, having done this sort of charting before in other industries, it's really impossible to tell the difference between a linear trend and a polynomial one when you're at the low-end of the curve; to the extent that there are errors and other external factors in the counting you really can't be sure which is which. Right now it appears that a year ago the average was more like 300 books a day and today it's about 500 books a day, but it could turn out over the next couple of years to be a linear trend that averages 400 books a day. You just never know for sure.
Thanks, again, for keeping tabs on it.
-Joe "Not a numbers guy, but I've seen Numb3rs on TV"