Repeated Measures Design

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A longitudinal study is a correlational research study that involves repeated observations of the same items over long periods of time - often many decades. It is a type of observational study. 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 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. Because of this benefit, longitudinal studies make observing changes more accurate and they are applied in various other fields