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Báo cáo khoa học: "Un programme simple de régression non-linéaire pondérée adapté aux estimations de biomasse forestière"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Un programme simple de régression non-linéaire pondérée adapté aux estimations de biomasse forestière. | Ann. Sci. For. 1988 45 4 399-412 Un programme simple de regression non-linéaire pondérée adapté aux estimations de biomasse forestiere J.E. BERGEZ J.L. BISCH A. CABANETTES L. PAGES INRA Station de Sylviculture Centre de Recherches d Orleans Ardon F 45160 Olivet Summary A simple non-linear weighted regression computer program for forest biomass estimations The paper presents a computer program destined to fit experimental data through the nonlinear models Y a Xl X2e b OU Y a Xl b This kind of model is particularly interesting for forestry biomass estimations where Y dry weight XI diameter X2 height of the tree . The program takes into account the research of optimal values for both exponents a and p the possibility to weight the residuals of the regression with a power function of the explanatory data x X or x as the case may be the calculation of the confidence bounds level 95 p. 100 for estimated values the calculation of the error when a such an equation is used to predict an estimation of the total biomass 2Y of a population. The practical interest of the program stands in its flexibility conversational program with possibilities of choice and a partial presentation of the important intermediate results on the screen helping to choose the best option and in the fact that it is a self sufficient program for the PC. Key words Computer program regression biomass error precision optimization confidence bound. Résumé On presente un programme permettant 1 ajustement de données experimentales aux modèles non-linéaires Y a Xl X2iJ b OU Y a Xl b Adresse actuelle Office National des Forets Division de Mulhouse 21 rue de 1 Est F 68100 Mulhouse. Adresse actuelle INRA Station d Agronomie Domaine Saint-Paul B.p. 91 F 84140 Montfavet. 400 J.E. BERGEZ et al. particulièrement utile dans le domaine des estimations de biomasse forestiere Y biomasse totale d un arbre XI -- diamètre à 1 30 m X2 hauteur totale . Le calcul intègre à la fois la recherche des valeurs optimales des .