Regression analysis of variance table confirms the linear relationship between dependent and independent variables since the significance level is less than 0.05. According to regression test theory:
• The determining coefficient between the components of knowledge from customer and competitive advantage in e-commerce is 18%. Which shows 18% of changes in the competitive advantage in e-commerce is influenced by knowledge from costumer. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 3.590 + 0.181 Knowledge from customers
• The determining coefficient between the components of knowledge for customer and competitive advantage in e-commerce is 15.1%. Which shows 15.1% of changes in the competitive advantage in e-commerce is influenced by knowledge for costumer. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 2.881 + 0.342 Knowledge for customers
The determining coefficient between the components of knowledge about customer and competitive advantage in e-commerce is 44.7%. Which shows 44.7% of changes in the competitive advantage in e-commerce is influenced by knowledge about costumer. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 2.365 + 0.465 Knowledge about customer
• The determining coefficient between the components of recording and spreading customers' knowledge and competitive advantage in e-commerce is 30.7%. Which shows 30.7% of changes in the competitive advantage in e-commerce is influenced by recording and spreading customers' knowledge. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 3.325 + 0.227 Recording and spreading customers' knowledge
The determining coefficient between the components of quality of the products and services and competitive advantage in e-commerce is 23%. Which shows 23% of changes in the competitive advantage in e-commerce is influenced by quality of the products and services. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 3.369 + 0.223 Quality of the products and services
The determining coefficient between the components of pace of providing the products and services and competitive advantage in e-commerce is 21.9%. Which shows 21.9% of changes in the competitive advantage in e-commerce is influenced by pace of providing the products and services. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 3.469 + 0.208 Pace of providing the products and services
The determining coefficient between the components of reasonable prices and competitive advantage in e-commerce is 16.6%. Which shows 16.6% of changes in the competitive advantage in e-commerce is influenced by reasonable prices. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 3.608 + 0.174 Reasonable prices
The determining coefficient between the components of satisfaction and competitive advantage in e-commerce is 4.4%. Which shows 4.4% of changes in the competitive advantage in e-commerce is influenced by satisfaction. Summary of the obtained results and the regression line equation are as follows:
- Competitive Advantage in E-commerce = 3.879 + 0.096 Satisfaction
4.2.2 Multiple Regression Analysis
Sometimes two or more variables have a major impact on the dependent variable. In this situation, the dependent variable multiple regression is used. The linearity assumption in multiple regressions of relationships between variables is also confirmed and thus the regression equation is defined as follows:
y = a+b1x1+b2x2+b3x3 +... [27]. (1)
The results and output tables obtained from the multiple regression analysis test by SPSS software are presented in the table 5.
The significance level (sig) for the components of pace of providing the products and services and satisfaction is more than 0.05, which indicates no linear relationship exists between the above factors and competitive advantage in e-commerce. On the other hand, the significance level (sig) of components of knowledge from customers, knowledge for customer, knowledge about customer, recording and spreading customers' knowledge, quality of the products and services and reasonable prices is less than 0.05, which indicates a linear relationship exists between the above factors and competitive advantage in e-commerce. The determining coefficient is 72.2% between the above components and the competitive advantage in e-commerce and this indicates that 72.2% of the change in component of competitive advantage in e-commerce is affected by the components of the knowledge from customers, knowledge for customer, knowledge about customer, recording and spreading customers' knowledge, quality of the products and services and reasonable prices. Multiple regression line equation and the obtained results are summarized, as follows:
Table 5: Results of multiple regression analysis of 8 factors and competitive advantage in e-commerce
Competitive Advantage in E-commerce = 0.933 + 0.076 Knowledge from customers + 0.234 Knowledge for customer + 0.222 Knowledge about customer + 0.116 Recording and spreading customers' knowledge + 0.107 Quality of the products and services + 0.057 Reasonable prices