TY JOUR TI METHODOLOGY FOR STATISTICAL PROCESSING OF THE SYLVICULTURAL RESEARCH RESULTS USING MATHCAD APPLICATION PACKAGE KW mathematical and statistical processing KW sylvicultural research KW statistical data processing KW reliability of research results KW Mathcad application package (Mathcad AP). JO Forestry Engineering Journal AU Kruzhilin, S.N. AU Baryshnikova, E.V. AU Mishenina, M.P. PY 2019 IS 9 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov