Comment on Ding and Miratrix: “To Adjust or Not to Adjust?”
نویسنده
چکیده
I commend the authors for undertaking a detailed analysis of the bias produced by indiscriminate adjustments for pretreatment covariates [1]. While I agree with the analysis, I take exception to the authors’ conclusion that “for linear systems, except in some extreme cases, adjusting for all the pretreatment covariates is in fact a reasonable choice.” My reading of the analysis leads to the conclusion that indiscriminate adjustment is likely to introduce appreciable bias in causal effect estimates. Ding and Miratrix (DM) divide their analysis into two parts: 1. Exact M-Structure, and 2. Deviations from M-structures.
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تاریخ انتشار 2015