在做门槛回归时 出现matrix has missing values，但我的并没有缺失值，请问是怎么回事? 下面是我的数据。另外，Dtr,是虚拟变量*变量，因为我不会用stata生成，所以在excle里直接做成这形式，不知是否争取？ 坐等高手
| id | year | c | e | t | Dtr | g |
| 1 | 2005 | 56.9068192 | 46.06375728 | 22.41562658 | 3.904717558 | 1.826486776 |
| 1 | 2006 | 56.72794056 | 45.32756386 | 22.53314876 | 3.940684946 | 2.466905737 |
| 1 | 2007 | 56.49461893 | 44.69286963 | 21.88678639 | 4.167527462 | 2.285414597 |
| 1 | 2008 | 56.88246659 | 45.17588759 | 21.66656752 | 3.183730348 | -0.080667606 |
| 2 | 2005 | 18.76011509 | 31.25157346 | 22.53314876 | 2.311229995 | 0.684655658 |
| 2 | 2006 | 18.35386145 | 30.00388954 | 11.0225161 | 2.41535935 | 3.7 |
| 2 | 2007 | 17.87276096 | 28.69754993 | 11.48857319 | 2.358904674 | 3.269045323 |
| 2 | 2008 | 18.29614358 | 28.80790686 | 11.55388471 | 2.379780095 | 1.083201046 |
| 3 | 2005 | 64.97458327 | 16.0053423 | 21.88678639 | 0 | 1.302728144 |
| 3 | 2006 | 57.912143 | 15.72084936 | 11.55388471 | 0 | 1.692904245 |
| 3 | 2007 | 57.33649502 | 14.80052057 | 10.47485337 | 0 | 2.192186233 |
| 3 | 2008 | 63.7289294 | 16.16266897 | 9.279197333 | 0 | -1.041636034 |
| 4 | 2005 | 10.54397374 | 41.16322196 | 21.66656752 | 0 | 2.085765842 |
| 4 | 2006 | 10.93169945 | 40.18058147 | 21.88678639 | 0 | 1.302728144 |
| 4 | 2007 | 10.47485337 | 39.87456217 | 28.93156283 | 0 | 3.466163321 |
| 4 | 2008 | 9.279197333 | 43.21681882 | 25.89568204 | 0 | -1.102864344 |
| 5 | 2005 | 70.06757241 | 21.24571206 | 22.53314876 | 0 | 3.075623082 |
| 5 | 2006 | 69.85617184 | 21.12343685 | 11.55388471 | 0 | 1.692904245 |
| 5 | 2007 | 69.99240786 | 21.46657308 | 28.93156283 | 0 | 3.466163321 |
| 5 | 2008 | 70.57731393 | 23.24631311 | 10.38035628 | 0 | -0.359088281 |
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