Evaluation Glossary

Longitudinal Data

Sometimes called "time series 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.

Source

US Environmental Protection Agency. (2007). Program Evaluation Glossary. Office of the Administrator/Office of Policy/Office of Strategic Environmental Management/Evaluation Support Division.

Related Terms

Panel Data
Time-series Designs