Compatible crown ratio and crown height models
- 1 June 1987
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Forest Research
- Vol. 17 (6) , 572-574
- https://doi.org/10.1139/x87-096
Abstract
Several published crown ratio and crown height models were fited to plantation loblolly pine [Pinus taeda] tree data, but none were considered entirely adequate. A nonlinear model form that yields logical estimates is presented. Required inputs are stand age, tree diameter, and tree height. Both ordinary least squares and seemingly unrelated regression (SUR) were used to estimate model parameters. Cross equation constraints with the SUR procedure result in compatible estimates of crown ratio and crown height for a tree of given height.This publication has 1 reference indexed in Scilit:
- Seemingly unrelated nonlinear regressionsJournal of Econometrics, 1975