Before revision:  We regress alpha and beta over size and other factors for individual stocks in Standard & Poor 500,  for randomly generated portfolios , and for Standard Poor 400 Mid-Cap and 600 Small-Cap.
After revision:  We regress alpha and beta over size and other factors for individual stocks in Standard & Poor 500, and for randomly generated portfolios , and for Standard Poor 400 Mid-Cap and 600 Small-Cap.