Abstract
We propose exploratory, easily implemented methods for diagnosing the appropriateness of an underlying copula model for bivariate failure time data, allowing censoring in either or both failure times. It is found that the proposed approach effectively distinguishes gamma from positive stable copula models when the sample is moderately large or the association is strong. Data from the Women’s Health and Aging Study (WHAS, Guralnik et al., The Womens’s Health and Aging Study: Health and Social Characterisitics of Older Women with Disability. National Institute on Aging: Bethesda, Mayland, 1995) are analyzed to demonstrate the proposed diagnostic methodology. The positive stable model gives a better overall fit to these data than the gamma frailty model, but it tends to underestimate association at the later time points. The finding is consistent with recent theory differentiating ‘catastrophic’ from ‘progressive’ disability onset in older adults. The proposed methods supply an interpretable quantity for copula diagnosis. We hope that they will usefully inform practitioners as to the reasonableness of their modeling choices.
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chen, Mc., Bandeen-Roche, K. A Diagnostic for Association in Bivariate Survival Models. Lifetime Data Anal 11, 245–264 (2005). https://doi.org/10.1007/s10985-004-0386-8
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DOI: https://doi.org/10.1007/s10985-004-0386-8