These apparent inconsistencies are typical of regression results when the independent variables are not orthogonal. They are not inconsistencies if the meaning of the word “partial” in partial regression coefficients and partial sums of squares is remembered. “Partial” indicates that the regression coefficient or the sum of squares is the contribution of that particular independent variable after taking into account the effects of all other independent variables. Only when an independent variable is orthogonal to all other independent variables are its simple and partial regression coefficients and its simple and partial sums of squares equal.