Proc mixed results

[yuanci]

Hello,

So after using the mixed procedure, I get "." for the F value and p-value for my interaction term. Does this mean the interaction term is insignificant or did I do something wrong?

[plf515]

Please show your code and say more about the variables. You ought to get at least one value, but some will be blank. See the examples in the documentation for PROC MIXED

[yuanci]

My code:

proc mixed;
  class side event subj;
  model FA = event side event*side;
  repeated event / type=cs subject = subj;
  title2 "MIXED";
run;

My results:

                                                         MIXED


                                                  The Mixed Procedure


                                               Convergence criteria met.                    




                                             Covariance Parameter Estimates

                                            Cov Parm     Subject    Estimate


                                            CS           subj       0.002596
                                            Residual                0.001612




                                                    Fit Statistics


                                         -2 Res Log Likelihood          -363.5
                                         AIC (smaller is better)        -359.5
                                         AICC (smaller is better)       -359.4
                                         BIC (smaller is better)        -356.6




                                            Null Model Likelihood Ratio Test

                                              DF    Chi-Square      Pr > ChiSq


                                               1         55.28          <.0001




                                             Type 3 Tests of Fixed Effects

                                                   Num     Den
                                    Effect          DF      DF    F Value    Pr > F


                                    event            1      30       2.41    0.1312
                                    side             1      30       3.61    0.0672
                                    side*event       0       .        .       .    

I'm just wondering if the missing values for side*event means there's no interaction or if something is wrong with the code/data. Thanks~

Thanks~