This paper uses average monthly returns and linear spline regressions to investigate the relation between expected return and firm size during 1980-1994. We find that the average monthly returns are approximately constant across size deciles. The estimated spline regressions vary substantially from year-to-year. Our analysis of the year- by-year estimates suggests that the annual regression function is essentially flat, except possibly for the smallest two deciles. The results are similar for the January and non-January months. Hence, the evidence does not support the prevalent use of size as an explanatory variable for returns during the 1980-1994 period.
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Paper provided by EconWPA in its series Econometrics with number
9608001.
Length: 40 pages Date of creation: 15 Aug 1996 Date of revision: Handle: RePEc:wpa:wuwpem:9608001
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