Programming the statistical procedures from SAS

specifying same level-1 interacttions in the random statement in proc mixed

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specifying same level-1 interacttions in the random statement in proc mixed

X and Z are two level-1 random effects. Is this correct?
proc mixed model y=x z x*z; random x z;
Or do I need to define in the data step xz=x*z;, and write the model
proc mixed model y=x z x*z; random x z xz;?
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