大家好，这是我参考网页上搜到的语句写的一个有调节的中介模型，运行起来没问题，但我是MPLUS小白，不太确定这个语句正确与否，所以想请大家帮忙看一下这个语句有没有问题，谢谢大家了



USEVARIABLES = X1 X2 X3 X4 M1 M2 M3 M4
W1 W2 W3 W4
Y1 Y2 Y3 Y4;
Missing are all(99);
ANALYSIS:
   TYPE = GENERAL RANDOM;
   ESTIMATOR = ML;
   ALGORITHM = INTEGRATION;
MODEL:
   X BY X1 X2 X3 X4;
   M BY M1 M2 M3 M4;
   W BY W1* W2 W3 W4;
   Y BY Y1 Y2 Y3 Y4;
    W@1;
   XW | X XWITH W;
   Y ON M (b1);
   Y ON X (cdash);
   M ON X (a1);
   M ON W (a2);
   M ON XW (a3);
MODEL CONSTRAINT:
    NEW(LOW_W MED_W HIGH_W
    IND_LOWW IND_MEDW IND_HIW
    TOT_LOWW TOT_MEDW TOT_HIW);
    LOW_W = -1;   
    MED_W = 0;   
    HIGH_W = 1;   
    IND_LOWW = a1*b1 + a3*b1*LOW_W;
    IND_MEDW = a1*b1 + a3*b1*MED_W;
    IND_HIW = a1*b1 + a3*b1*HIGH_W;
    TOT_LOWW = IND_LOWW + cdash;
    TOT_MEDW = IND_MEDW + cdash;
    TOT_HIW = IND_HIW + cdash;
    PLOT(LOMOD MEDMOD HIMOD);
    LOOP(XVAL,-3,3,0.1);
    LOMOD = IND_LOWW*XVAL;
    MEDMOD = IND_MEDW*XVAL;
    HIMOD = IND_HIW*XVAL;
PLOT:
   TYPE = plot2;
OUTPUT:
   STAND CINT;