In cases where personalization is impractical or unnecessary, recommender applications can very efficiently provide statistical summaries of community opinion. These summaries include within-community popularity measures (e.g., percentage of people who like or purchase an item) and aggregate or summary ratings (e.g., number of people who recommend an item, average rating for an item). They include systems such as eBay's customer feedback, which provides average ratings of buyers and sellers. Prospective sellers and buyers can consult the average and the individual evaluations but cannot see the rating by "customers I've agreed with." While these summaries provide only non-personalized recommendations, they are popular because they are easy to compute, and they can be used in non-customized environments such as physical store displays
In cases where personalization is impractical or unnecessary, recommender applications can very efficiently provide statistical summaries of community opinion. These summaries include within-community popularity measures (e.g., percentage of people who like or purchase an item) and aggregate or summary ratings (e.g., number of people who recommend an item, average rating for an item). They include systems such as eBay's customer feedback, which provides average ratings of buyers and sellers. Prospective sellers and buyers can consult the average and the individual evaluations but cannot see the rating by "customers I've agreed with." While these summaries provide only non-personalized recommendations, they are popular because they are easy to compute,และพวกเขาสามารถใช้ในการปรับสภาพแวดล้อม เช่น ร้านค้าทางกายภาพที่ไม่แสดง
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