本人做面板回归时，为什么行业控制之后出现下面的情况，应该怎么办？
ind
2 0 (omitted)
3 0 (omitted)
4 0 (omitted)
5 0 (omitted)
6 0 (omitted)
7 0 (omitted)
8 0 (omitted)
9 0 (omitted)
10 0 (omitted)
11 0 (omitted)
12 0 (omitted)
13 0 (omitted)
14 0 (omitted)
15 0 (omitted)
16 0 (omitted)
17 0 (omitted)