Transcription of Chapter 37 The LIFETEST Procedure
{{id}} {{{paragraph}}}
Example: biology
Chapter 37 The LIFETEST Procedure
Chapter 37 The LIFETEST ProcedureChapter Table of LIFETEST ..1816 IDStatement ..1818 ComputationalFormulas ..1818 OutputDataSets ..1825 ComputerResources ..1826 DisplayedOutput ..1827 ODST ableNames .. Product-Limit Estimates and Tests of Association for the VALungCancerData .. Chapter 37. The LIFETEST ProcedureSAS OnlineDoc : Version 8 Chapter 37 The LIFETEST ProcedureOverviewA common feature of lifetime or survival data is the presence of right-censored ob-servations due either to withdrawal of experimental units or to termination of theexperiment. For such observations, you know only that the lifetime exceeded a givenvalue; the exact lifetime remains unknown. Such data cannot be analyzed by ignoringthe censored observations because, among other considerations, the longer-lived unitsare generally more likely to be censored. The analysis methodology must correctlyuse the censored observations as well as the noncensored observations.
For example, consider the results of a small randomized trial on rats. Suppose you assign forty rats exposed to a carcinogen into two treatment groups. The event of interest is death from cancer induced by the carcinogen. The response is the time from randomization to death. Four rats died of other causes; their survival times are
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: