Methods: AD cases were identified in the Washington Heights Inwood Columbia Aging Project, a longitudinal, community-based study of cognitive aging in Northern Manhattan. The sample comprised 323 participants whowere initially dementia-free but developed AD during study follow-up (incident cases). Participants were followed for an average of 4.1 (up to 12.6) years. Possible factors associated w...

This software fits a multivariate proportional hazards model to interval censored event data by a Bayesian approach. Right and interval censored data and a lognormal or gamma frailty term can be fitted. An example is studied and the output analysed. 1 The basic model The data, based on a sample of size n, consists of the triple (ti, δi,xi), i = 1, . . . , n where ti is the time on study for sub...

Objectives The Cox proportional hazards (PH) model is commonly used in randomised clinical trials (RCTs) to assess a treatment effect after adjusting for known prognostic factors. However, the Cox model requires that a covariate effect is constant over time. Violation of this assumption invalidates the simple Cox model. Various PH checks exist, some in the form of statistical tests and some emp...

RESEARCH DESIGN AND METHODSdFracture-related hospitalization was defined using International Classification of Diseases, 9th revision, codes (733.1–733.19, 733.93– 733.98, or 800–829). We calculated the incidence rate of fracture-related hospitalization by age and used Cox proportional hazards models to investigate the association of diabetes with risk of fracture after adjustment for demograph...

Cox proportional hazards model is a widely used method to analyse time-to-event data for survival analysis. In the medical field, age is the most common confounder of any association between risk factor and disease since most risk factors and the risk of disease change with age. Usually, age recorded at the start of the study (age-at-baseline) will be adjusted for in the model to account for th...

This paper uses the Cox proportional hazards model to analyze recent Broadway show data to investigate the factors that relate to the longevity of shows The type of show whether a show is a revival and rst week attendance for the show are predictive for longevity Favorable critic re views in the Daily News are related to greater success but reviews in The New York Times are not Winning major To...

This paper studies Cox‘s proportional hazards model under covariate measurement error. Nakamura‘s (1990) methodology of corrected log-likelihood will be applied to the so called Breslow likelihood, which is, in the absence of measurement error, equivalent to partial likelihood. For a general error model with possibly heteroscedastic and non-normal additive measurement error, corrected estimator...