The polynomials, along with the fitted coefficients, form the multiple regression equations.
2.
We can explore one issue caused by multicollinearity by examining the process of attempting to obtain estimates for the parameters of the multiple regression equation
3.
Like the multiple regression equation transform, grid-based methods use a low-order interpolation method for converting map coordinates, but in two dimensions instead of three.
4.
The expected values can be interpreted as follows : The mean salary of public school teachers in the West is equal to the intercept term ? 1 in the multiple regression equation and the differential intercept coefficients, ? 2 and ? 3, explain by how much the mean salaries of teachers in the North and South Regions vary from that of the teachers in the West.