Методи обробки дослідних даних для моделювання твірної стовбурів дуба звичайного

Abstract

Abstract. Different methods of determining the volume of tree trunk in
Ukraine and abroad are analyzed within this research. The expediency of
determining volumes of trunks based on mathematical model of its generatrix is
substantiated. Stages of preparation of experimental data for modeling of trunk
generatrix are determined. On the example of research material collected at the
state enterprise “Smila forest economy”, a generalization of data on shape of
oak tree trunks using form quotients in a relative coordinate system was
performed. By constructing a diagram and using Student's t-criterion, it was
found that there is no difference between shape indices of model trees
belonging to different height classes. By means of a robust method based on
interquartile distance with development of a box plot, the research material has
been tested for presence of non-typical data (“overshoots”). For detection of
overshoots, the necessity of simultaneous analysis of form quotients and form
factors of model trees was substantiated. The analysis of changes in main
statistics of the sample have been analyzed in case of elimination of the
detected non-typical data.
Keywords: trunk generatrix, form quotient, Student’s t-criterion, robust
methods, interquartile distance, box plot, non-typical data.