aftsem

Implements several basic algorithms for estimating regression parameters for semiparametric accelerated failure time (AFT) model. The main methods are: Jin rank-based method (Jin (2003)), Heller’s estimating method (Heller (2012)), Polynomial smoothed Gehan function method (Chung (2013)), Buckley-James method (Buckley (1979)) and Jin's improved least squares method (Jin (2006)). This package can be used for modeling right-censored data and for comparing different estimation algorithms.

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