Statisticians have realized that there is one issue that is far more important than sample size to producing useful data, and that is bias. If one does not draw an accurate sample, one cannot speak intelligently about the nature of the population. PRC works hard to reduce bias in several ways, including using a telephone methodology, sampling by week, employing highly-trained interviewers, speaking to the actual patient, and controlling the interview context.
Survey Bias Reduction
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