This study is to review retirement function measures for estimating capital stocks. The measures include Retirement Probability Density Function(RPDF), Retirement Cumulative Distribution Function(RCDF), Retirement Survival Function(RSF) and Retirement Rate Function(RRF). The paper also provides the recommendations for using RRF as a distinct identification of the retirement curve functions for empirical service lives data.

• 최성운(가천대학교 산업공학과 교수)