Discuss the disadvantages of different types of scanner data

What will be an ideal response?

A major weakness of scanner data is lack of representativeness. National volume tracking data may not be projectable onto the total population, because only large supermarkets have scanners. Also, certain types of outlets, such as food warehouses and mass merchandisers, are excluded. Likewise, scanners have limited geographical dispersion and coverage.

The quality of scanner data may be limited by several factors. All products may not be scanned. For example, a clerk may use the register to ring up a heavy item to avoid lifting it. If an item does not scan on the first try, the clerk may key in the price and ignore the bar code. Sometimes a consumer purchases many flavors of the same item, but the clerk scans only one package and then rings in the number of purchases. Thus, the transaction is inaccurately recorded. With respect to scanner panels, the system provides information on TV sets in use rather than actual viewing behavior. Although scanner data provide behavioral and sales information, they do not provide information on underlying attitudes, preferences, and reasons for specific choices.