A fixed sample panel design is the same thing as a before-and-after quasi-experimental design.

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A fixed sample panel design involves the same group of participants being surveyed or observed at multiple time points, while a before-and-after quasi-experimental design involves intervention or treatment being administered to a group at one time point followed by measurements being taken at a later time point. While there may be similarities in the data collected, the design and methodology are different.

A Fixed Sample Panel Design Is the Same Thing as a Before-And-After