We find that a longitudinal study requires massive plenty of time and at sometimes are often very expensive. Due to its expensiveness, the study tends to have few groups of subjects, which at times makes it harder to relate the results to a bigger population. Another big problem is that various participants at times drop out of the study, reducing the sample size while decreasing the amount of the collected data.

What are some changes you think could be made that would help support the study today based on the problem you identified?

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