%0 Research article
%T Height-diameter models for Scots pine and birch in Finland
%A Mehtätalo, Lauri
%D 2005
%J Silva Fennica
%V 39
%N 1
%R doi:10.14214/sf.395
%U https://silvafennica.fi/article/395
%X Height-Diameter (H-D) models for two shade-intolerant tree species were  estimated from longitudinal data. The longitudinal character of the data  was taken into account by estimating the models as random effects  models using two nested levels: stand and measurement occasion level.  The results show that the parameters of the H-D equation develop over  time but the development rate varies between stands. Therefore the  development of the parameters is not linked to the stand age but to the  median diameter of the basal-area weighted diameter distribution (DGM).  Models were estimated with different predictor combinations in order to  produce appropriate models for different situations. The estimated  models can be localized for a new stand using measured heights and  diameters, presumably from different points in time, and the H-D curves  can be projected into the future.