Updated item set to remove some good items which turned out to be bad
when running 2013-09-30
New script to use the old items to predict the sales of a new item,
using the grouped customers
Disqualify groups from regression if the group size is too small,
or quantity is zero
New set of "good items"
New column "sales" in output
Moved forecast returning into new function
Fixed bug in computation of "sales" column
New function for forecasting sales using myopic demand model
Changed comment
New function RevenueRatio
Included missing "source RevenueRatio" lines
Normalize the "price.week" column
Corrected mistake in how revenue ratio was computed
New method for determining who is a first-time cookie
Made normalizing prices an option
Changed to print the past and future weeks for the new item
Implemented cookie forecasting
Compute MAPEs and revenue ratios for the myopic method
View item summary of item set 130929
Added comments