Def: A developmental research design that examines development by making a series of observations or measurements over time. Typically, a group of individuals who are all the same age is measured at different points in time.
-The individuals are usually cohorts, roughly the same age, who have grown up in similar circumstances.
-Several measurements of a particular variable are made in the same individuals at two or more times in their
lives to investigate the relationship between age and that variable.
-nonexperimental design, specifically, a one-group pretest-post-test design
-The distinction between a longitudinal design and a time-series design is not always clear.
Adv:
-the absence of cohort effects because the researcher examines one group of people over time rather than comparing groups that represent different ages and come from different generations
-a researcher can discuss how a single individual's
behavior changes with age
Disadv:
-extremely time-consuming, both for the participants (it requires a big commitment to continue in the study) and the researcher (the researcher must stay interested in the research and wait for years to see the final results)
-very expensive to conduct because researchers need to track people down and persuade them, when necessary, to come back to participate in the study
-subject to high dropout rates of participants. People lose interest in the
study, move away, or die
HDEV5
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