Randomization-Based Causal Inference from Unbalanced 2^2 Split-Plot Designs

Anqi Zhao, Peng Ding, Tirthankar Dasgupta

Given two 2-level factors of interest, a 2^2 split-plot design} (a) takes each of the $2^2=4$ possible factorial combinations as a treatment, (b) identifies one factor as `whole-pl…