The NPD Group, Port Washington, NY, said Friday it has been tracking American athletic footwear purchases via online technology for its new online consumer service. NPD has been tracking information from more than 20,000 consumers per week, including teen subsets, the company said. It plans to deliver this information much quicker than it has to its subscribers and plans to soon supplement its reports with data on consumer satisfaction and future purchase intent. The company also said it will integrate its retail point-of-sale database with its new online consumer database. The integration will allow for more detailed reporting and broader coverage of product movement and pricing at the category and brand level.