It's called Data Mining. Most universities with a statistics/OR/IE/FE department teach data mining. Amazon had LOTS of affiliates, or companies they work with to collect data. (review sites, other sites that sell items, etc). You probably visited one those.
-DB
It's called Data Mining. Most universities with a statistics/OR/IE/FE department teach data mining. Amazon had LOTS of affiliates, or companies they work with to collect data. (review sites, other sites that sell items, etc). You probably visited one those. -DB