RANDOM SELECTION is a probability-based selection protocol in which each unit has a known probability of being selected. The chances of selection need not be equal for each unit, as long as the chances are known for each unit.
VAD, in business, can mean: Value of Annual Demand, Value-Added Data, Value-Added Dealer, or, Value-Added Distributor.
PPBS is PPBS is Program Planning Budgeting System.
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