Longitudinal study - Wikipedia
A longitudinal study (or longitudinal survey, or panel study) is a research design that involves repeated observations of the same variables (e.g., people) over long periods of time (i.e., uses longitudinal data). It is often a type of observational study, although it can also be structured as longitudinal randomized experiment.[1] Longitudinal studies are often used in social-personality and clin
Empiricism - Wikipedia
In philosophy, empiricism is an epistemological view which holds that true knowledge or justification comes only or primarily from sensory experience.[1] It is one of several competing views within epistemology, along with rationalism and skepticism. Empiricism emphasizes the central role of empirical evidence in the formation of ideas, rather than innate ideas or traditions.[2] Empiricists may ar
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