Assessing the Construct Validity of Strategic and SIC‐Based Measures of Corporate Diversification
比较了五种企业多元化测量方法（Rumelt分类、熵、Berry-Herfindahl指数等）在54家财富500强公司中的内容效度、收敛效度、判别效度、单维性和预测效度，发现各方法间支持度较弱，引发对多元化测量及其与绩效关系可靠性的质疑。
Several new methods of measuring corporate diversification have been developed since Rumelt's (1974) seminal work. These methods use varying criteria but they have not been backed up by construct validity. The present study investigates the content, convergent, discriminant, unidimensionality, and predictive validity by comparing 54 Fortune 500 companies on Rumelt's classification (self‐reported and calculated), entropy, Berry‐ Herfindahl index, and broad and mean narrow spectrum diversification measures. Results indicate only mild support for convergence, discriminant and predictive validity, and no evidence of unidimensionality amongst these measures. This raises problems in the measurement of diversification and subsequent relationships to performance linkages.