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distributional assumptions about the shape of the baseline hazard and allow to consider firm-level unobserved heterogeneity. The …
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Bivariate duration data frequently arise in economics, biostatistics and other areas. In "bivariate frailty models", dependence between the frailties (i.e., unobserved determinants) induces dependence between the durations. Using notions of quadrant dependence, we study restrictions that this...
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