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数据为平行面板数据
code time feature1 feature2 feature3 feature4 feature5 ...
1 1 ... ... ... ... ... ...
... ... ... ... ... ... ... ...
1 t ... ... ... ... ... ...
2 1 ... ... ... ... ... ...
... ... ... ... ... ... ... ...
2 t ... ... ... ... ... ...
3 1 ... ... ... ... ... ...
... ... ... ... ... ... ... ...
3 t ... ... ... ... ... ...
To recognize that particular combinations of features might mute or reinforce the impact of some of the others, we construct a covariance matrix of design features in which each variable is standardized to have
a mean of zero and a standard deviation of one.
......uses the first three principal component of the vector of design features as the endogenous variable......
关于这一段的文字说明都看懂了，但是红色字体部分不知道是如何通过stata实现的？选择协方差矩阵向量的前3个主要成分作为因变量，具体的结构是怎样构成的？
在此先谢谢啦^_^
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