各位高手、学友好！我想用STATA做空间计量的面板分析，对象是30个省份直辖市12年的数据，被解释变量是生态效率，解释变量是产业结构高级化、合理化以及其他控制变量，同时生成了空间权重矩阵，命令和数据检查如下(请问哪里出错)：
. use 1-3copy.dta,clear

. spatwmat using provW.dta, name(W)


The following matrix has been created:

1. Imported non-binary weights matrix W
   Dimension: 30x30



. spatwmat using Wnonstandized.dta, name(WNS) e(ENS)


The following matrices have been created:

1. Imported binary weights matrix WNS
   Dimension: 30x30

2. Eigenvalues matrix ENS
   Dimension: 30x1



. xsmle ecoeff tl ts gdp labor lngdpp lngdpp2 indu2rate energycon urbanrate exdep cdprate lneninv eduyear lnfinv yr4 yr5 yr8, wmat
> (W) model(sdm) durbin(ts) robust nolog noeffects fe
Error - the panel data must be strongly balanced with no missing values
invalid syntax
r(198);

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