具体说明如下：
目标是提取根据P分组的x5变量，即根据变量P的内容将其分为A B C三组，单独提取出三段数值：A组的x5，B组的x5，C组的x5。请问在STATA中应该用什么命令实现这个呢？
P | x1 | x2 | x3 | x4 | x5 |
A | 0.794453 | 0.400379 | 0.309338 | 0.921736 | 0.395814 |
B | 0.004914 | 0.190357 | 0.639545 | 0.747623 | 0.049264 |
B | 0.05162 | 0.644538 | 0.032547 | 0.793116 | 0.67746 |
C | 0.615714 | 0.339404 | 0.435112 | 0.203953 | 0.140851 |
A | 0.580315 | 0.290274 | 0.807215 | 0.63653 | 0.134913 |
A | 0.025504 | 0.684519 | 0.044369 | 0.696357 | 0.441961 |
C | 0.850903 | 0.116127 | 0.639183 | 0.320093 | 0.510569 |
C | 0.66577 | 0.289311 | 0.563699 | 0.134334 | 0.150926 |
B | 0.460012 | 0.09571 | 0.263938 | 0.79883 | 0.916331 |
B | 0.095609 | 0.056159 | 0.300632 | 0.774674 | 0.308967 |
B | 0.485605 | 0.445222 | 0.837713 | 0.560925 | 0.911081 |
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