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Accelerated Failure Time (AFT) models

version 1.2 (19.7 KB) by

Fits accelerated failure time models in the presence of right and/or left censoring.

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The “aft” function fits models of the form:

Y=log(T)=g0+g1*Z1+g2*Z2+...+sigma*epsilon

where usually T is a time to event variable and g0, g1, ... and sigma are to be estimated. Since T is a time to event variable censoring might be involved. The “aft” function deals with possibly right and/or left censored data. With "sigma" we denote the scale parameter, and the regression coefficients are denoted by vector g=[g0 g1 g2...]. The covariates are denoted with Z1, Z2, ...

The distribution of "epsilon" defines the distribution of T. The user can specify this distribution using one of the following available options:
Exponential, Weibull, Log-normal, Log-logistic, Generalized Gamma.

The “aft” routine is supposed to be a MATLAB alternative to proc lifereg of SAS, or survreg of R. However the “aft” has less options.

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1.2

Just deleted an unnecessary m.file which was forgotten in there. No changes at all.

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MATLAB 7.10 (R2010a)

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