Verifying timber price stability for the reforestation optimal control model

This paper deals with validating of an assumption of the reforestation optimal control model. We focus on prices of different timber types. These serve as inputs for the simulation which gives the data for estimation of prescribed functions, whose parameters are used for the optimal control problem solution. As usual, parameters of such models are assumed as constants. Presence of trend in particular timber price development is tested. Rate of constancy violation is assessed also by testing equality of trend slopes. Rejected are both insignificance and equality of trend slopes. Using pairwise comparisons and cluster analysis it is possible to form sets with similar trend slopes.