Longitudinal Data

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DEFINITION of 'Longitudinal Data'

The process of collecting sample observations from a larger population over a given time period. Longitudinal data is used in statistical and financial studies.

INVESTOPEDIA EXPLAINS 'Longitudinal Data'

The process of analyzing past return data for a given security is an example of using longitudinal data. By collecting daily, weekly or monthly return data, a financial analyst can determine past return trends, and calculate the stock's value at risk (VaR) using the historical method.

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