Researchers realize that while it may provide invaluable information,a _____ study is time-consuming and expensive,and it has problems associated with attrition.

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A longitudinal study is a research design that follows a group of people over an extended period of time, collecting in-depth data on their experiences and behaviors. This type of study is time-consuming and expensive since it requires long-term data collection and tracking of participants. Additionally, attrition can be a problem, as participants may drop out of the study over time, leading to missing data and potential biases. Cross-sectional studies, on the other hand, collect data at a specific point in time and are less expensive and time-consuming, but do not provide information on how individuals change over time. Cross-sequential studies combine aspects of both longitudinal and cross-sectional designs, but may also suffer from attrition issues. Clinical studies are a type of research that typically focuses on evaluating the effectiveness and safety of medical interventions, and may or may not involve longitudinal data collection.

Researchers Realize That While It May Provide Invaluable Information,a _____