Callbacks are a survey disposition that is specific to telephone surveys. They are a common temporary survey disposition because fewer than half of all completed interviews occur on the first dialing of a case. Callbacks happen for a number of reasons. For example, an interviewer might dial a telephone number in the sampling pool and be told that the designated respondent is not available to complete the interview at the time of the call. In other cases, the interviewer might reach the designated respondent but learn that he or she would prefer to complete the interview at another time. A callback might also occur if an interviewer dials a telephone number and reaches an answering machine or a voicemail service. Callbacks are considered a positive ...
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