000738 : At least one statistical result was invalid (NULL). Please check the VIF values to determine whether near perfect multicollinearity is present.

Description

Poor models with extreme multicollinearity will occasionally produce invalid test statistics.

Solution

Look for extreme multicollinearity (redundancy in the explanatory variables) by examining the VIF values. Remove variables that are redundant, as indicated by VIF values larger than about 7. If the VIF values do not indicate a multicollinearity problem, make sure the dependent variable is specified correctly.