Abstract
Quality-adjusted lifetime (QAL) is an important component in evaluation of clinical trials. In a seminal paper, Gelber et al. (1989) claimed that the Kaplan–Meier estimator is inconsistent in estimating the distribution of QAL under the presence of censoring. However, in this article, we show that, with appropriate censoring indexing, the Kaplan–Meier estimator actually is consistent in some practically important QAL data settings.
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