Computer shipments statistics:What do they mean?

摘要

Home and office PC (personal com-puter) manufacturers compete very heavily for share-or should we say shares-of market.As the computer industry matures it becomes more and more segmented-PCs vs.laptops,for instance.Manufacturer shipment data is closely held and available in only a few places.Unlike many industries where trade associations collect and report statistical data,computer shipment data is held in the hands of commercial enterprises that spend millions collecting the information and make even more millions selling it.