Statistical methods without estimating the missingness mechanism: adiscussion of ‘statistical inference for nonignorable missing data problems: aselective review’ by Niansheng Tang and Yuanyuan Ju

First of all, I wholeheartedly congratulate Tang and Ju(referred to as TJ hereafter) on a well-written comprehensive review paper that surveys cutting-edge statistical theory and methodology relevant to estimation,influence analysis and model selection in regressionmodels with missing data.