Acturial Science > EXAM > BACHELOR OF ACTURIAL SCIENCEUNIT CODE:SMS 3466 (SURVIVAL ANALYSIS) |Download solved exam for quality (All)

BACHELOR OF ACTURIAL SCIENCEUNIT CODE:SMS 3466 (SURVIVAL ANALYSIS) |Download solved exam for quality grades |

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A) State two key features of survival analysis data (2 marks)i) Survival times of units of observation are usually censored.ii) Survival times are non - negative and positively skewed. B) Distinguish... between left censoring and right censoring and give a suitable example for each case.i) Left censuring: Prevents us from knowing when entry into the state which we wish to observe tookplace.Example 1: In medical studies, where patients are subject to regular examinations, discovery of acondition tells us only that the onset fell in the period since the previous examination, the time elapsedsince onset has been left censored.Example 2: When estimating functions of exact age and we don't know the exact date of birth.Example 3: When estimating functions of duration since onset of sickness and you don't know theexact date of becoming sick.ii) Right Censoring: Cuts short the investigation in progress so we don't know exactly when the eventof interest happened, we only know it happened after a certain date.Example: In mortality investigations conducted over a period of one year, all those still alive at theend of the year will dies sometime after the end of the investigation, but we don't know when. A personstill alive when the investigation ends are right censored. We only know that their lives times exceedsome values. C)What do you understand by the term graduation as used in survival analysis? Why is it important?Graduation: This is the process of using statistical methods or techniques to improve the estimatesprovided by the crude rates.Importance of GraduationTo use the information available from adjacent ages to improve the reliability of the estimates.To produce a smooth set of rates that are suitable for a particular purpose.To remove sampling errors [Show More]

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