我的程序如下：
data:file is 2.dat;
vari:names are code
year
y
x1
x2
x3
x4
m1
m21
m22
k1
k2
k3
k4
k5
k6
k7
k8
k9
x12
x22
x32
x42;
usev=y
x12
m1
m21;
missing=all(-999);
anal:esti=ml;
type=general;
boot=1000;
model:m1 on x12(s1);
m21 on m1(s2)
x12(s4);
y on m1(s5)
m21(s3)
x12(s6);
model constraint:new(ind1-ind4);
ind1=s1*s5;
ind2=s4*s3;
ind3=ind1-ind2;
ind4=s1*s2*s3;
outp:sampstat;stdyx;cint(bcbootstrap);




请大家帮看看，为什么不显示拟合值呢？