Abstract
This paper describes a statistical analysis concerning a confidence interval for median survival time for 498 male carcinomas of the lung in the presence of rightcensored observations. The cases analyzed were a part of the data from the fourth clinical trial involving 2, 493 cases of lung cancer carried out by the Lung Cancer Task Force Japan Joint Committee on TNM Classification (1978).
Brookmyer & Crowley's stastical methods were used for estimating median survival time and the length of the nonparametric confidence interval. The analytical result in the illustrative data showed that the median survival time was 26.2 months and the length of the nonparametric confidence interval was [23-24] months.
