Aggregate data
Aggregate or macro data are data about populations, groups, regions or countries. These are data that have been averaged, totalled or otherwise derived from the individual level data found in the survey datasets.
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Aggregate or macro data are data about populations, groups, regions or countries. These are data that have been averaged, totalled or otherwise derived from the individual level data found in the survey datasets.
Sample attrition refers to the loss of study units from a sample after an initial wave of data collection. For example, individuals who take part in a first wave of a longitudinal study dropping out at a sunsequent wave.