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Time to event data arise in several fields including biostatistics, demography, economics, engineering and sociology. The terms duration analysis, event-history analysis, failure-time analysis, reliability analysis, and transition analysis refer essentially to the same group of techniques although the emphases in certain modeling aspects could differ across disciplines. SAS procedures LIFETEST, LIFEREG, PHREG, RELIABILITY, and QLIM have different capabilities for analyzing duration data. Methods include Kaplan-Meier estimation, accelerated life-testing models, and the ubiquitous Cox model. Recent developments in SAS extend their reach to include analyses of multiple failure times, recurrent events, frailty models, Markov models and use of Bayesian methods.
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