Sometimes data files have frequency weights (also sometimes known as replication weights). For example, if two people gave the same answer in a survey, the data file may only contain the data for one of these people with a frequency weight being used to indicate that the data should be counted as two people (i.e., the weight would have a value of 2). Please note: if weighting data by profit, customer value, frequency or consumption (i.e., volumetric analysis), the weights are likely sampling weights, not frequency weights.
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