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 delta-method. (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 log-logistic 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