Before revision:  In this paper, we consider a situation called adaptive experimental design where research subjects sequentially visit a researcher, and the researcher assigns a treatment. For estimating the ATE efficiently, we consider changing the probability of assigning a treatment at a period by using past information obtained until the period .
After revision:  In this paper, we consider a situation called adaptive experimental design where research subjects sequentially . In adaptive experimental design, the experimenter is allowed to change the probability of assigning a treatment at a period by using past information obtained until the period .