Life Table & Survival Time Distribution Results - Advanced Tab

Life Table Analysis

Select the Advanced tab of the Life Table & Survival Time Distribution Results dialog box to access options to display the results of the analysis in various spreadsheets.

Summary: Life table. Click the Summary: Life table button to display a spreadsheet with the complete life table. In addition to the standard descriptive statistics, this spreadsheet will contain estimates of the cumulative survival, the hazard rate, survival probability density, and the median life expectancy at each interval (see the Introductory Overview for a definition of these estimates). The standard errors of these estimates are also computed.

Results for model. Use the Results for model drop-down box to fit to the data one of the four common theoretical distributions of survival times: Exponential, Linear Hazard, Gompertz, and Weibull (see the Introductory Overview section; see also Notes and Technical Information for the interpretation of the parameters for the Weibull distribution). The selection you make determines the output (parameters, graphs) displayed after selecting other options in this dialog box.

Parameter estimates. Click the Parameter Estimates button to display a spreadsheet with the parameter estimates for the respective theoretical survival distribution. The particular model (theoretical distribution) to which the parameter estimates pertain can be chosen via the Results for model drop-down box (see above). Survival Analysis will fit the theoretical distributions via ordinary unweighted least squares (i.e., all weights equal to 1), and two methods of weighted least squares (see Notes and Technical Information for the interpretation of the parameters for the Weibull distribution). See also Weibull and Reliability/Failure Time Analysis in the Process Analysis module for options to fit the Weibull distribution to raw data using maximum likelihood method.

Estimates of survival function, Estimates of hazard function, Estimates of prob. density funct. Click these buttons to display a spreadsheet with the respective estimates for each time interval, based on the survival function, the hazard function, or the probability density function, respectively. The particular model (theoretical distribution) to which the parameter estimates pertain can be chosen via the Results for model drop-down box (see above). Estimates based on the unweighted and two weighted least squares methods will be reported in the spreadsheet.