A Comparison of Two Life Table Methods

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Abstract
A comparison was made of results from the life table methods of Cutler and Ederer [1958] and Chiang [1960a, b; 1961]. Survival rates and standard errors were calculated from hypothetical populations with various survival experiences. The discrepancy of the 2 methods was found to be negligible for survival rates and standard errors when the withdrawing rates were [less than or equal to]30% and the lost-to-follow-up rate <40%. The survival rates for these methods were equal when the death rate in the withdrawal group was zero. The withdrawal rate and the withdrawal death rate were found to be the variables most significant in introducing discrepancies between (a) survival rates and (b) standard errors. Application of these methods to data from an observed population showed that the differences are negligible when the withdrawing rate is small.

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