Browsing by Author "Davidse, Alistair"

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    A comparison of methods for analysing interval-censored and truncated survival data
    (2004) Davidse, Alistair; Juritz, June
    This thesis examines three methods for analysing right-censored data: the Cox proportional hazards model (Cox, 1972), the Buckley-James regression model (Buckley and James, 1979) and the accelerated failure time model. These models are extended to incorporate the analysis of interval-censored and left-truncated data. The models are compared in an attempt to determine whether one model performs better than the others in terms of goodness-of-it and in terms of predictive power. Plots of the residuals and random effects from the Cox proportional hazards model are also examined.
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    Early and late direct costs in a Southern African antiretroviral treatment programme: a retrospective cohort analysis
    (Public Library of Science, 2009) Leisegang, Rory; Cleary, Susan; Hislop, Michael; Davidse, Alistair; Regensberg, Leon; Little, Francesca; Maartens, Gary
    Gary Maartens and colleagues describe the direct heath care costs and identify the drivers of cost over time in an HIV managed care program in Southern Africa.