Given the differences between cross-sectional and longitudinal studies,a major drawback of longitudinal studies is that

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Longitudinal studies follow participants over time, often for many years. This can make them very time-consuming and expensive to conduct. In some cases, the researchers may not be able to complete the study because the individuals they are following drop out, move away, or die before the study is completed. Additionally, researchers may have to wait many years before they are able to see any significant changes in the variables they are measuring, which makes the interpretation of the results challenging.

Given the Differences Between Cross-Sectional and Longitudinal Studies,a Major Drawback