我的数据是30个省 2003年-2013年的 tfp rd ofdi ifdi,导师建议“力争将2003年以来OFDI对TC&EC的影响变化计算出来“ 意思是不是就要得出每一年的回归结果？  这个如何操作？  我看了论坛之前的帖子，https://bbs.pinggu.org/thread-1018129-1-1.html     写着*仅显示各回归的结果
bys year industry: reg y x*
于是我照猫画虎  写了bys year province: reg tfp rd ofdi ifdi
但是结果却是这样的  不知道为什么  希望知道的朋友能帮我一下    谢谢了   stata eviews操作都可以
bys year province: reg tfp rd ofdi ifdi

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-> year = 2003, province = 1
insufficient observations

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-> year = 2003, province = 2
insufficient observations

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-> year = 2003, province = 3
insufficient observations

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-> year = 2003, province = 4
insufficient observations

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-> year = 2003, province = 5
insufficient observations

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-> year = 2003, province = 6
insufficient observations

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-> year = 2003, province = 7
insufficient observations

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-> year = 2003, province = 8
insufficient observations

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-> year = 2003, province = 9
insufficient observations

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-> year = 2003, province = 10
insufficient observations

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-> year = 2003, province = 11
insufficient observations