Compatible biomass models for main tree species with measurement error in Heilongjiang Province of Northeast China. RESEARCH ON WEIGHTING REGRESSION AND MODELLING Compatible Tree Volume Equations and Heteroscedasticity for Dahurian Larch in Different Region of Daxing‘anling Bias Correction in Logarithmic Regression and Comparison with Weighted Regression for Non-linear Models Individual Tree Diameter Increment Model for Chinese Fir Plantation Based on Two-Level Linear Mixed Effects Models