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What does RDD stand for?

RDD stands for Random Digit Dialing

This definition appears very frequently

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Other Resources:
We have 97 other meanings of RDD in our Acronym Attic

Samples in periodicals archive:

We acknowledge that a "bank" of these readily accessible controls could permit more rapid recruitment of participants in numerous age strata and obviate the need for extensive random digit dialing to recruit an adequate age-matched control population in many investigations.