MEASURES OF DIVERSIFICATION: PREDICTORS OF REGIONAL ECONOMIC INSTABILITY*
研究了哪种区域经济多样化衡量指标最能解释不同区域间的经济不稳定差异，发现修正异方差后，投资组合方差指标的解释力最强。
ABSTRACT This work focuses on determining which measure of regional economic diversification best explains differences in economic instability across regions. One recent article found that a portfolio variance measure had the highest explanatory power. Another researcher found that an entropy measure was best after the model was corrected for heteroscedasticity. Results presented here indicate that, after correction for heteroscedasticity, portfolio variance once again displays the greatest power to explain cross‐sectional variation in observed regional instability.