Unformatted text preview: / under Section 1.10. (a) Fit a Weibull model to this data including the covariates disease type, graft type, and an interaction. Find the maximum likelihood estimates for the baseline hazard parameters λ and γ and the regression coeﬃcients of the PH model. (b) Compute the standard errors of these parameters using the multivariate deltamethod. (c) Find the mle for the median survival for all four groups and compare. 4. Repeat parts a), and c) from the previous exercise using the loglogistic model. Which model do you prefer? Explain. Feel free to use evidence from graphical checks and by appropriate comparisons of the log likelihood....
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This note was uploaded on 01/15/2012 for the course STA 6934 taught by Professor Young during the Fall '08 term at University of Florida.
 Fall '08
 YOUNG

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