Kang, Joseph; Su, Xiaogang; Hitsman, Brian; Liu, Kiang; … - In: Journal of Applied Statistics 39 (2012) 3, pp. 513-529
Treatment effect in an observational study of relatively large scale can be described as a mixture of effects among subgroups. In particular, analysis for estimating the treatment effect at the level of an entire sample potentially involves not only differential effects across subgroups of the...