说矩阵有缺失值，但我检查过矩阵并没有缺失值，请问怎么解决？
我看了下矩阵，海南省没有邻居，所对应的都是0，如果换成0.00001，又可以使用
xsmle JZ3 lnFDI lnTI INS2 GOV JC ,fe model(sdm) wmat(B4) dmat(B4) type(time) nolog effects
Warning: All regressors will be spatially lagged

convergence not achieved
Warning: e(V) matrix is not positive definite.
         Spatial effects Std. Err. will be computed using a modified
         positive definite matrix (Rebonato and Jackel, 2000).
Computing marginal effects standard errors using MC simulation...
estimates post: matrix has missing values
r(504);