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Thursday, June 30 • 11:42am - 12:00pm
Most Likely Transformations

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The "mlt" package implements maximum likelihood estimation in the class of conditional transformation models. Based on a suitable explicit parameterisation of the unconditional or conditional transformation function using infrastructure from package "basefun", we show how one can define, estimate and compare a cascade of increasingly complex transformation models in the maximum likelihood framework. Models for the unconditional or conditional distribution function of any univariate response variable are set-up and estimated in the same computational framework simply by choosing an appropriate transformation function and parameterisation thereof. As it is computationally cheap to evaluate the distribution function, models can be estimated by maximisation of the exact likelihood, especially in the presence of random censoring or truncation. The relatively dense high-level implementation in the "R" system for statistical computing allows generalisation of many established implementations of linear transformation models, such as the Cox model or other parametric models for the analysis of survival or ordered categorical data, to the more complex situations illustrated in this paper.

avatar for Julie Josse

Julie Josse



Torsten Hothorn

University of Zurich

Thursday June 30, 2016 11:42am - 12:00pm
McCaw Hall 326 Galvez Street Stanford, CA 94305-6105

Attendees (84)