RT Journal Article SR Electronic T1 Equity Duration, Growth Options, and Asset Pricing JF The Journal of Portfolio Management FD Institutional Investor Journals SP 105 OP 111 DO 10.3905/jpm.2000.319725 VO 26 IS 3 A1 Bradford Cornell YR 2000 UL https://pm-research.com/content/26/3/105.abstract AB Because much of the value of equity depends on option characteristics of investment projects, it is not feasible to calculate equity duration directly. As a result, recent literature has focused on estimating equity duration empirically. Using twenty–five size and book–to–market portfolios, the author shows the estimates of equity duration are critically dependent on the specification of the regression model used to estimate equity duration.