用stata做Wald时，Wald for SEM,命令：<br>
testnl ([Wx]x1=-[Spatial]rho*[Main]x1)([Wx]x2=-[spatial]rho*[Main]x2)([Wx]x3=-[spatial]rho*[Main]x3)([Wx]x4=-[spatial]rho*[Main]x4)([Wx]x5=-[spatial]rho*[Main]x5)([Wx]x6=-[spatial]rho*[Main]x6)([Wx]x7=-[spatial]rho*[Main]x7)<br>
在此之前进行了<br>
xsmle x1 x2 x3 x4 x5 x6 x7, fe wmat(W) model(sdm) type(both) nolog，<br>
但是在运行testnl之后显示：equation [spatial] not found,<br>
想问一下大神们这个怎么解决，