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<p><b>New page</b></p><div>'''Longitudinal study'''<br />
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A '''longitudinal study''' is a research design that involves repeated observations of the same variables (e.g., people) over short or long periods of time. It is often used in psychology, social science, and health science to study long-term trends (e.g., drug use, disease rates, criminal behavior) over time.<br />
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== Overview ==<br />
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Longitudinal studies are often used in [[psychology]] to study developmental trends across the life span, and in [[sociology]] to study life events throughout lifetimes or generations. The reason for this is that unlike [[cross-sectional study|cross-sectional studies]], longitudinal studies track the same people, and therefore the differences observed in those people are less likely to be the result of cultural differences across generations.<br />
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Longitudinal studies are also used in [[medicine]] to uncover predictors of certain diseases. In medicine, they are often used to estimate the incidence of disease in a population, to examine risk factors, and to observe disease progression.<br />
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== Types of Longitudinal Studies ==<br />
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There are several types of longitudinal studies:<br />
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* '''Panel Study''': This involves studying a group of individuals (a panel) over time.<br />
* '''Cohort Study''': This involves studying a specific population, or cohort, over time.<br />
* '''Retrospective Study''': This involves looking back at historical information.<br />
* '''Prospective Study''': This involves looking forward, and includes predictions or potential outcomes.<br />
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== Advantages and Disadvantages ==<br />
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Longitudinal studies have several advantages and disadvantages. They allow researchers to look at changes over time, but they can also be time-consuming and expensive. They can provide a wealth of detailed information, but they can also be affected by changes in the research team or funding.<br />
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== See Also ==<br />
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* [[Cross-sectional study]]<br />
* [[Cohort study]]<br />
* [[Case-control study]]<br />
* [[Observational study]]<br />
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== References ==<br />
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<references /><br />
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[[Category:Research methods]]<br />
[[Category:Epidemiology]]<br />
[[Category:Medical research]]<br />
[[Category:Psychology]]<br />
[[Category:Sociology]]<br />
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