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Asking questions about past behaviors in a survey is quite common, but also problematic. The assumption is that respondents can give an accurate account of what they did, how often they did it or how much time, energy and money they spent doing it. The fact is that our memory fails more than we want to admit. Respondents, often and unintentionally make memory-based errors which lead to over- or understatements of their actions.
Factors that affect memory in the context of a survey include:

The type of event is being asked about
Feelings about and meaning of the event
How often an event has…

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