Earnings Yields, Market Values, and Stock Returns
用1951-1986年数据重新检验盈利收益率和公司规模对股票回报的影响，发现盈利收益率效应在全年显著，而规模效应仅在1月显著，且亏损公司也有高回报。
Earlier evidence concerning the relation between stock returns and the effects of size and earnings to price ratio (E/P) is not clear-cut. This paper re-examines these two effects with (a) a substantially longer sample period, 1951–1986, (b) data that are reasonably free of survivor biases, (c) both portfolio and seemingly unrelated regression tests, and (d) an emphasis on the important differences between January and other months. Over the entire period, the earnings yield effect is significant in both January and the other eleven months. Conversely, the size effect is significantly negative only in January. We also find evidence of consistently high returns for firms of all sizes with negative earnings.