Life Tables and Kaplan-Meier Analysis: Nonparametric Survival Analysis (Statistical Associates Blue Book Series 35)
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Life Tables and Kaplan-Meier Analysis: Nonparametric Survival Analysis (Statistical Associates Blue Book Series 35)
Life tables refers to a statistical procedure which generates duration (time to event) distributions for an entire dataset or separately for each level of a factor. As such it is a form of nonparametric survival analysis. The primary output is a life table in which the rows are researcher-defined time intervals and the columns have to do with counts, probabilities, and cumulative probabilities of the event of interest occurring during the given time interval.
Kaplan-Meier survival analysis (KMSA) is a method of generating tables and plots of survival or hazard functions for event history data (time to event data). Time to event data might include time to a report of symptomatic relief following a treatment or time to making a contribution following receipt of a fund-raising appeal. KMSA is also a form of nonparametric survival analysis. That is, KMSA is a descriptive procedure for time-to-event variables for use when time is considered the only salient variable.
Table of Contents
Overview5
Life Tables6
Key Terms and Concepts6
Example6
Variables6
Life tables analysis in SPSS7
The SPSS user interface7
SPSS options8
SPSS life tables output9
The life table9
Median survival time table10
Overall comparisons table10
Survival function plot12
One minus survival plot13
Density function plot14
Hazard function plot14
Assumptions of life tables analysis15
Censored cases not different15
Probabilities depend on time15
Kaplan-Meier Analysis15
Overview15
Key Concepts and Terms16
Example16
Censored cases16
Time variable17
Status variable18
Stratification variable18
Factors and factor comparisons18
The “Compare Factor†button19
The overall comparisons table19
Survival tables and plots21
Survival table21
Mean and median for survival time table22
The quartiles/percentiles table23
The survival plot23
The “One minus survival functions†plot24
Hazard plot25
Log survival plot26
Saving output as variables27
Assumptions28
Events dependent only on time28
Frequently asked questions about KMSA29
How do you obtain KMSA output in Stata?29
How are Kaplan-Meier survival tables related to "Life Tables"?30
Bibliography30
Pagecount 32
