Final Report on the Effects of Sample Attrition on Estimates of Channeling's Impacts. IV. USE OF MEDICARE DATA TO ESTIMATE THE EFFECTS OF ATTRITION ON IMPACT ESTIMATES


The previous chapter described the types of attrition that could lead to bias in impact estimates, and a statistical method for measuring and eliminating this bias. Before implementing these statistical procedures, however, we take advantage of the fact that Medicare data are available for virtually the entire sample to determine directly how restriction of the analysis to a subset of the full research sample affects some estimates of channeling impacts.

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