Longitudinal data

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Energy glossary

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Longitudinal data

Meaning of term longitudinal data

Observations collected over a period of time The sample (instances or cases) may or may not be the same each time but the population remains constant Longitudinal data are sometimes called "time series data (GAO, Designing Evaluations 1991, p. 92)

Source: http://www.desc.dla.mil/dcm/files/all%20inclusive%20energy%20glossary.xls

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