The Use of Mathematical and Statistical Analysis in Selecting of Best Regression Equation for Quercus Infectoria G.Olivier

Abstract The purpose of this study is to use mathematical and statistical analysis in testing the performance ability standard volume models prediction Gall Oak trees. A sample 205 non - destructive trees was purposely selected from Duhok Governorate, Kurdistan region, Iraq. Of which 157 were used for estimating parameters regression rest (48) served as validation data. Using computer facilities, available software packages, tools including STATGRAPHIC Centurion Excel tool, 28 estimated. multistage procedure screening generated equations selecting most appropriate one, underwent with independent In study, a new criterion proposed accuracy dependent variable. At end process, equation Vt = 0.00442+0.0108D^1.917H finally one that fits