= Random digit dialing
{wiki=Random_digit_dialing}
Random digit dialing (RDD) is a survey sampling technique used primarily for telephone research. It involves generating telephone numbers at random, including both listed and unlisted numbers, to ensure a representative sample of the population being studied. This method is particularly useful for telephone surveys where researchers want to gather opinions or data from a broad demographic without biasing the sample selection based on pre-existing lists of phone numbers.
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