TY CONF TI RESEARCH AND DEVELOPMENT OF SALES FORECAST MODELS BASED ON CORRELATION AND REGRESSION KW Planning KW economic and mathematical approaches KW regression analysis KW Pearson correlation criterion JO ENERGY-SAVING AND ENVIRONMENTALLY SAFE TECHNOLOGIES OF THE TIMBER INDUSTRY – 2025 AU Antsiferova, V.I. AU Petrov, B.Y. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov