Optimal Comparable Weighting and Selection: A Comment
比较了Vandell和Gau等人在市场比较法中选取和加权可比物的两种方法，分析其偏差和方差，指出在异方差误差结构下应修正回归本身而非加权过程。
Vandell (1991) and Gau, et al. (1992) have recently developed rigorous methods for selecting and weighting comparables for the market comparison approach to valuation. This paper compares the statistical properties of the Vandell and Gau approaches; specifically, it examines the bias and variance produced by both approaches. Under classical OLS assumptions, Vandell's method is preferable; when these assumptions are violated, the size and direction of the violation will determine which method is preferable. Finally, the paper concludes that when the regression producing the adjustment factors has an heteroskedastic error structure, corrections should be made to the regression itself, rather than as part of the comparable weighting and selection process.