Dating methodology

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Active blocks of telephone numbers (area code exchange two-digit block number) that contained three or more residential directory listings were selected with probabilities in proportion to their share of listed telephone households; after selection two more digits were added randomly to complete the number.This method guarantees coverage of every assigned phone number regardless of whether that number is directory listed, purposely unlisted, or too new to be listed.

The survey was conducted by Princeton Survey Research International.The survey’s margin of error is the largest 95% confidence interval for any estimated proportion based on the total sample— the one around 50%.For example, the margin of error for the entire sample is ±1.9%.If no male was available, interviewers asked to speak with the oldest female at home.This systematic respondent selection technique has been shown to produce samples that closely mirror the population in terms of age and gender.

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