Chapter 5. Discrete Probability Distributions in the textbook: 5.1 The Probability Distribution for a Discrete Variable (pp. 186-188) It may be a good idea to work on your own to calculate the mean, ...

The variance v(a i) of the cumulative probability estimate a i =1-R i is computed using the exact variance method of Nelson (1990 pp. 150-151).. If no right censoring has occurred before t i, then a i ...