The density plots show the marginal posterior distribution of the association parameter alpha
of each of the univariate joint models. Each model uses the current value association structure, so alpha
is the log fold change to the hazard rate of death for each unit increase of the biomarker. In other words, alpha
is the increase in the log hazard of death per unit increase of the biomarker. alpha
above 0 is evidence that the biomarker is positively associated with mortality.
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