Correlation coefficient of Pearson. And multiple linear regression analysis. A set of independent variables by one fifth of the variables into the equation, all Statistical significance was set at .05.
A Pearson correlation coefficients and regression analysis, linear multiplication the independent variable 5 variables according to Equation 1 into all the options by configuring the statistical significance at the .05 level.
abrasion resistance correlation analysis recession-peers, and multiplied by a set of linear independent variables variable 1 5. To complete the configuration, all statistically significant at .05.