DATA:flie is dat.dat;VARIABLE:name are group m mm x xm y;between is xm mm;within is x m;cluster is group;DEFINE:center x m (groupmean);ANALYSIS:type is twolevel random;estimator=bayes;fbiterations=50000;chain=2;MODEL:%within%sa | m on x;sb | y on m;sc | y on x;chain=2;%between%sa with sb(cab);mm on xm(ab);y on mm(bb)xm;sa;sb;MODEL PRIORS: aw~n(0,100);bw~n(0,100);ab~n(0,100);bb~n(0,100);MODEL CONSTRAINT:new(indb indw);indw=awbw+cab;indb=avbb;OUTPUT:tech8;PLOT:type=plot2;请问这样一个代码,我想加入控制变量x1,x2,x3代码该如何修改


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