Periodic surveys
Periodic surveys are conducted at regular intervals, ranging from weekly to annually held surveys. They use a new sample of respondents for each survey, focusing on the same topic and allowing the analysis of trends over a period. Periodic surveys are conducted by mail, personal interview and telephone.
The disadvantage here could be that when periodic surveys are conducted at known intervals, they might affect the behavior being measured.
An example of this kind of surveys could be TRPs.
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