Fixed effects refer to a statistical technique used in experimental design that controls for variables that do not change over time within a given group. By using fixed effects, researchers can isolate the impact of the variables of interest while accounting for unobserved factors that may confound results. This approach is particularly useful in split-plot designs, where different experimental units may be subjected to different treatments, allowing for more accurate estimation of treatment effects.
congrats on reading the definition of fixed effects. now let's actually learn it.