Time-Dependent Hazard Ratio: Modeling and Hypothesis Testing with Application in Lupus Nephritis
时变风险比:建模、假设检验及狼疮性肾炎应用AI 解读 ↓
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时变风险比:建模、假设检验及狼疮性肾炎应用AI 解读 ↓
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We investigate the association between duration of untreated disease and survival in lupus nephritis, a rare rheumatologic disease. In this case, as in many other studies of survival, a priori considerations suggest that the effect of the predictor on hazard may change with increasing follow-up time. To accommodate such situations, we use regression splines to model the hazard ratio as a flexible function of time. We propose model-based tests of the hypotheses of hazards proportionality and of no association. We evaluate the accuracy of estimation and inference in simulations and also present analysis of a larger medical data set.