Abstract
The first major study of industry effects in market returns was performed by King [2]. He used principal components analysis and clustering techniques on a sample of 63 companies chosen from six 2-digit industries based on Security and Exchange Commission codes. SEC codes are similar to the Standard Industrial Classification codes defined by the U.S. Bureau of the Budget [4]. SIC codes are 4-digit codes based on the principal end product of the firm. They are chosen so that, as the lowest order digit is removed, the companies are aggregated into broader but still similar groups.
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