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Survival Analysis: An observational study is conducted to compare the survival experience of individuals with brain cancer following treatment. Participants undergo treatment and are followed until the time of recurrence, until they are lost to follow-up or up to 40 weeks, whichever comes first. The following table details the experiences of participants undergoing radiotherapy alone or radiotherapy and surgery. The data below are week to recurrence or week of last contact. Using the Kaplan-Meier approach, what is the Survival Probability at the end of 8 weeks for radiotherapy alone? (Hint: set up a table for radiotherapy including columns for time (week), Nt, Dt, Ct, and St+1) Radiotherapy Alone Surgery/Radiotherapy Weeks to recurrence Week of Last Contact (no recurrence) Weeks to recurrence Week of Last Contact (no recurrence) 2 3 2 10 2 4 6 14 2 5 10 21 5 6 23 7 29 8 32 34

Survival Analysis: An observational study is conducted to compare the survival experience of individuals with brain cancer following treatment. Participants undergo treatment and are followed until the time of recurrence, until they are lost to follow-up or up to 40 weeks, whichever comes first. The following table details the experiences of participants undergoing radiotherapy alone or radiotherapy and surgery. The data below are week to recurrence or week of last contact. Using the Kaplan-Meier approach, what is the Survival Probability at the end of 8 weeks for radiotherapy alone? (Hint: set up a table for radiotherapy including columns for time (week), Nt, Dt, Ct, and St+1) Radiotherapy Alone Surgery/Radiotherapy Weeks to recurrence Week of Last Contact (no recurrence) Weeks to recurrence Week of Last Contact (no recurrence) 2 3 2 10 2 4 6 14 2 5 10 21 5 6 23 7 29 8 32 34

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Survival Analysis: An observational study is conducted to compare the survival experience of individuals with brain cancer following treatment.  Participants undergo treatment and are followed until the time of recurrence, until they are lost to follow-up or up to 40 weeks, whichever comes first.  The following table details the experiences of participants undergoing radiotherapy alone or radiotherapy and surgery.  The data below are week to recurrence or week of last contact. Using the Kaplan-Meier approach, what is the Survival Probability at the end of 8 weeks for radiotherapy alone? (Hint: set up a table for radiotherapy including columns for time (week), Nt, Dt, Ct, and St+1) 


 Radiotherapy Alone       Surgery/Radiotherapy  
Weeks to recurrence Week of Last Contact  (no recurrence)   Weeks to recurrence Week of Last Contact  (no recurrence)
  2   3    2 10
  2     4     6 14
  2     5     10 21
  5     6       23
    7       29
    8       32
        34
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