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A goodness-of-fit score statistic for the proportional hazards assumption is derived from a partial likelihood and is shown to be a simplification of Schoenfeld's (1980) statistic. In the case of the several group problem, the test statistic may be formulated as a simple sum of quadratic expressions; a conservative form is also given in this case.
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Moreau et al. (1986) studied this question.
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