Add-a-Digit Sampling
Add-a-digit sampling is a method of creating a sample of telephone numbers to reach the general public within some geopolitical area of interest. This method is related to directory sampling in that the first step involves drawing a random sample of residential directory-listed telephone numbers from a telephone directory that covers the geographic area of interest. In add-a-digit sampling, the selected directory-listed telephone numbers are not called. Rather, they form the seeds for the list of numbers that will be called. For each directory-listed telephone number drawn from the telephone directory, the last digit of the telephone number is modified by adding one to the last digit. The resulting number is treated as one of the telephone numbers to be sampled. This is the simplest ...
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Reader's Guide
Ethical Issues In Survey Research
Measurement - Interviewer
Measurement - Mode
Measurement - Questionnaire
Measurement - Respondent
Measurement - Miscellaneous
Nonresponse - Item-Level
Nonresponse - Outcome Codes And Rates
Nonresponse - Unit-Level
Operations - General
Operations - In-Person Surveys
Operations - Interviewer-Administered Surveys
Operations - Mall Surveys
Operations - Telephone Surveys
Political And Election Polling
Public Opinion
Sampling, Coverage, And Weighting
Survey Industry
Survey Statistics
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