Causal Inference, Instrumental Variable, Ab Testing, Encouragement Design, Average Treatment Effect.
everyone, it is necessary to assume that non-compliers (i.e., always-takers and never-takers) have the same effect as compliers. Homogeneity: Assumes the ATE is the same for encouraged and non-encouraged subjects, both treated and untreated (this is one version of homogeneity named additive