Lifetime Data Anal - Cross-ratio estimation for bivariate failure times with left truncation.

Tópicos

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Resumo

The cross-ratio is an important local measure that characterizes the dependence between bivariate failure times. To estimate the cross-ratio in follow-up studies where delayed entry is present, estimation procedures need to account for left truncation. Ignoring left truncation yields biased estimates of the cross-ratio. We extend the method of Hu et al., Biometrika 98:341-354 (2011) by modifying the risk sets and relevant indicators to handle left-truncated bivariate failure times, which yields the cross-ratio estimate with desirable asymptotic properties that can be shown by the same techniques used in Hu et al., Biometrika 98:341-354 (2011). Numerical studies are conducted.

Resumo Limpo

crossratio import local measur character depend bivari failur time estim crossratio followup studi delay entri present estim procedur need account left truncat ignor left truncat yield bias estim crossratio extend method hu et al biometrika modifi risk set relev indic handl lefttrunc bivari failur time yield crossratio estim desir asymptot properti can shown techniqu use hu et al biometrika numer studi conduct

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