Changes in version 2.0.1 IMPROVEMENTS SINCE LAST RELEASE - Non-mixture of regression models are now added to the package. BUG FIXES - Several bugs are fixed. Changes in version 2.0.0 IMPROVEMENTS SINCE LAST RELEASE - The package is rewritten using .Call function. - The codes for Weibull distribution are improved. BUG FIXES - Several bugs are fixed which caused the results to be different for the same analysis. Changes in version 0.99.3 IMPROVEMENTS SINCE LAST RELEASE - Compatibility with bioconductor is added. Changes in version 0.99.0 - Package moved to bioconductor. BUG FIXES - Several bugs are fixed.