Journal
INTERNATIONAL JOURNAL OF BIOSTATISTICS
Volume 9, Issue 2, Pages 149-160Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/ijb-2013-0004
Keywords
sensitivity analysis; causal inference; coarsening at random
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In this article, we present a sensitivity analysis for drawing inferences about parameters that are not estimable from observed data without additional assumptions. We present the methodology using two different examples: a causal parameter that is not identifiable due to violations of the randomization assumption, and a parameter that is not estimable in the nonparametric model due to measurement error. Existing methods for tackling these problems assume a parametric model for the type of violation to the identifiability assumption and require the development of new estimators and inference for every new model. The method we present can be used in conjunction with any existing asymptotically linear estimator of an observed data parameter that approximates the unidentifiable full data parameter and does not require the study of additional models.
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