studies in which a group of people is tracked over a long period of time, sometimes even incorporating the group's children into the study as they come along
Investigation that collects information on the same individuals repeatedly over time, perhaps over many years, in an effort to determine how phenomena change. Compare with cross-sectional studies.
"before-after" studies; quasi-experimental
Research design in which the same subjects are studied over the course of a determined period of time.
are studies where individuals are followed over time. A fixed population ( cohort) may be monitored over a number of years. See also: Cancer Statistics See also: Five-Year-Survival See also: Case-Contro-Study See also: Cross-sectional Studies
studies in which data are obtained on the same individuals two or more times during a period of time (usually of considerable length, such as several months or years)
A type of study where the same subject or set of subjects participate at two or more different points in their lives.