A regression application for comparing growth potential of enviorments at different points in the growth cycle

Abstract

Regression techniques are used to quantify a procedure for indexing the productive capacity of forested sites. The regression model parameters θ' = (-y*, / β ₁,  β₂ , ... ,   β_m) are defined in such a way that the value of the indexing parameter y* identifies individual growth-over-time response curves from a family of curves that have the parameters β₁, β₂, ... , β_m in common. The β terms are estimated from historical cumulative growth data, while y* is estimated from these historical data together with r values of the response characteristic observed at a single point in the growth cycle of each new environment to which the prediction equations are to be applied. The formulation allows comparison of growth potential of environments containing equal-aged groups of experimental units that are at different points in the growth cycle, by means of an index defined as projected growth at a preselected common age.

Citation

Lloyd, F. Thomas; Muse, H. David; Hafley, William L. 1982. A regression application for comparing growth potential of enviorments at different points in the growth cycle. Biometrics: 38: 479-484.