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