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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. [ABSTRACT FROM AUTHOR]