A line in a two dimensional or two-variable space is defined
by the equation

Y=a+b1*X1+b2*X2+...+

Note that in this equation, the regression coefficients (or B coefficients) represent the independent contributions of each independent variable to the prediction of the dependent variable. However, their values may not be comparable between variables because they depend on the units of measurement or ranges of the respective variables. The Regression Summary spreadsheet will produce both the raw regression coefficients (B coefficients) and the beta coefficients (note that the beta coefficients are comparable across variables).

See also, the Multiple Regression Overviews.