@article{Sanquetta_do Carmo Dolci_Dalla Corte_Sanquetta_Pelissari_2017, place={Dracena, SP}, title={Form factors vs. regression models in volume estimation of Pinus taeda L. stem}, volume={45}, url={https://cientifica.dracena.unesp.br/index.php/cientifica/article/view/987}, DOI={10.15361/1984-5529.2017v45n2p175-181}, abstractNote={<p>Volume is an important information to know the available potential of a forest stand, although direct volume determination is expensive and often impractical. Thus, precise and accurate indirect methods are fundamental. Three volume estimation methods of <em>Pinus taeda</em> stem were compared: mean form factor, form factor by diameter class, and volume models fitted by regression. A total of 146 trees were used for this study, in which 96 were used for fitting and estimation, and 50 for validation, collected in the middle of the Paraná State, Brazil. Fitting statistics (R<sup>2</sup>aj and Syx%) were used to evaluate regression models. Bias, precision and accuracy statistics, t-test and residue graphical analysis were used to judge estimation methods. Estimation by mean form factor (diameter class) and the Spurr model were equivalent, being superior to the others examined. It was concluded that the use of mean form factor by diameter class has satisfactory statistical performance, robustness and simplicity in volume estimation.<strong></strong></p>}, number={2}, journal={Científica}, author={Sanquetta, Carlos Roberto and do Carmo Dolci, Marilia and Dalla Corte, Ana Paula and Sanquetta, Mateus Niroh Inoue and Pelissari, Allan Libanio}, year={2017}, month={abr.}, pages={175–181} }