Previous studies in the valuation of American options apparently undervalue the right of early exercise. This study uses actual prices from the CBOE's S&P 100 option instead of model-generated values. Deviations from the theoretical put-call parity relationship are caused by the possibility of early exercise. These deviations are used to infer the value of early exercise. The actual value of early exercise is both statistically and economically significant. As expected from theoretical considerations, the value of early exercise for put options is greater than for call options.

Charles J. Corrado, Terry L. Zivney, The Specification and Power of the Sign Test in Event Study Hypothesis Tests Using Daily Stock Returns, The Journal of Financial and Quantitative Analysis, Vol. 27, No. 3 (Sep., 1992), pp. 465-478

In the article Theory of Capital Structure, by Milton Harris and Artur Raviv (The Journal of Finance, March 1991, vol. 46, no. 1, pp. 297-355) there is an error in Tables IV, V, and VII concerning the description of results reported in Investment-Financing Nexus: Some Empirical Evidence, by Michael Long and Ileen Malitz (Midland Corporate Finance Journal, 1985). While the text of Theory of Capital Structure (p. 334) correctly states that Long and Malitz find a negative relationship between leverage and profitability, in Tables IV, V, and VII, a positive, but insignificant, relationship is incorrectly reported. The authors apologize for this error and thank Professor Michael Long of Rutgers University for bringing it to their attention.

ABSTRACT This study provides comprehensive publications performance data over a 25‐year period for finance doctorates. These data indicate that publishing one article per year in any finance journal (or finance, accounting, economics, or business journal) over any prolonged period of time is a truly remarkable feat, met by only 5% of the graduates. Tenure screens combining various quantity and quality requirements are examined to assess their ability to predict future publication productivity. Faculty and administrators seeking defensible benchmarks for evaluating faculty research productivity in finance will find that these data and results are particularly useful.

This study provides comprehensive publications performance data over a twenty-five-year period for finance doctorates. These data indicate that publishing one article per year in any finance journal (or finance, accounting, economics, or business journal) over any prolonged period of time is a truly remarkable feat, met by only 5 percent of the graduates. Tenure screens combining various quantity and quality requirements are examined to assess their ability to predict future publication productivity. Faculty and administrators seeking defensible benchmarks for evaluating faculty research productivity in finance will find that these data and results are particularly useful. Copyright 1992 by American Finance Association.

This study provides comprehensive publications performance data over a twenty-five-year period for finance doctorates. These data indicate that publishing one article per year in any finance journal (or finance, accounting, economics, or business journal) over any prolonged period of time is a truly remarkable feat, met by only 5 percent of the graduates. Tenure screens combining various quantity and quality requirements are examined to assess their ability to predict future publication productivity. Faculty and administrators seeking defensible benchmarks for evaluating faculty research productivity in finance will find that these data and results are particularly useful.