Estimating the Herfindahl Index From Concentration Ratio Data
研究发现美国研究中集中度与赫芬达尔指数的高相关性可能因使用估计值而偏高；基于新西兰数据，提出一种从上下界而非假设企业规模分布来估计赫芬达尔指数的新方法，并测试了不同估计量的效果。
Abstract High concentration ratio (C)—Herfindahl (H) index correlations found in United States studies may be biased upward by using estimated H. For New Zealand data, correlations between C and actual H are lower; the H—C relationship appears to be nonlinear. Guided by income distribution studies, a new family of H estimators—derived from H's upper and lower bounds rather than generalized assumptions about firm size distributions—is proposed. The methodology for calculating the bounds from concentration ratio data is described, and the efficacy of various estimators is tested.