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<p>data, in which the same small-scale or <a href="page.php?w=aggregate_data">aggregate</a> entity is observed at various points in time. Another type of data, <a href="page.php?w=panel_data">panel data</a> (or longitudinal data), combines both cross-sectional and time series data aspects and looks at how the subjects (firms, individuals, etc.) change over a time series. Panel data deals with the observations on the same subjects in different times.<a href="page.php?w=Panel_analysis">Panel analysis</a> uses panel data to examine changes in variables</p><p>
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