The standardized regression coefficient has been a common tool for assessing the effect, predictive power or explanative power of an independent variable (IV).
The pressure drop per hectometer and the relation of oil-gas water three-phase pressure drop and oil-water two-phase pressure were obtained by the regression analysis of the experimental data.
In the fitting methods of both the ordinary nonparametric regression models and the varying coefficient regression models, the error term of the models is usually assumed to be homoscedastic.
By making a primary orthogonal regression test, the major factor and best parameter combination were found out, which supply theoretical basis for further research on awn-removed principle and awner.