黃河泉 发表于 2020-1-30 11:21 
不是 Stata 的问题,是你资料的问题。
老师,我把全都是虚拟变量都是0的数据挑了出来,然后剩下的是存在虚拟变量为1的情况试了一下,但是还是不行,请问虚拟变量大概到什么程度,才可以回归呀
* Example generated by -dataex-. To install: ssc install dataex
clear
input int stkcd_id str9 year float E byte LNegE double(LE LNegEE LB LTACC) byte lnege_sum
2 "28-Jun-65" -7146391 0 4431488 0 1.230e+08 -15300000 5
2 "29-Jun-65" -13258085 1 -7146391 -7146391 99900000 -7455322 5
2 "30-Jun-65" 105375.43 1 -13300000 -13300000 1.080e+08 -66100000 5
2 "1-Jul-65" -7214630 0 105375.4 0 97800000 -3524150 5
2 "2-Jul-65" -10031422 1 -7214630 -7214630 85300000 19800000 5
2 "3-Jul-65" 14054383 1 -10000000 -10000000 89800000 -30200000 5
2 "4-Jul-65" 2680122 0 14100000 0 1.290e+08 -7670744 5
2 "5-Jul-65" 2047083.8 0 2680122 0 1.380e+08 -7196255 5
2 "6-Jul-65" 3313015.5 0 2047084 0 1.480e+08 -595411.6 5
2 "7-Jul-65" -7488241 0 3313016 0 1.450e+08 9736652 5
2 "8-Jul-65" 11744887 1 -7488241 -7488241 1.570e+08 -10300000 5
2 "9-Jul-65" 13568947 0 11700000 0 1.630e+08 12700000 5
2 "10-Jul-65" 19166520 0 13600000 0 1.780e+08 -1.350e+08 5
2 "11-Jul-65" 11409229 0 19200000 0 1.840e+08 -22400000 5
3 "28-Jun-65" -24406864 0 14800000 0 8.880e+08 -8014925 8
3 "29-Jun-65" -82075480 1 -24400000 -24400000 6.600e+08 -92300000 8
3 "30-Jun-65" -47854864 1 -82100000 -82100000 7.060e+08 -1.960e+08 8
3 "1-Jul-65" 6944579 1 -47900000 -47900000 7.590e+08 -1.470e+08 8
3 "2-Jul-65" -11524136 0 6944579 0 7.520e+08 49600000 8
3 "3-Jul-65" -63722572 1 -11500000 -11500000 7.020e+08 1.750e+08 8
3 "4-Jul-65" 45070024 1 -63700000 -63700000 6.750e+08 -77100000 8
3 "5-Jul-65" -15629605 0 45100000 0 6.600e+08 -47000000 8
3 "6-Jul-65" 6409134 1 -15600000 -15600000 6.820e+08 -1.780e+08 8
3 "7-Jul-65" -45292884 0 6409134 0 6.240e+08 -68000000 8
3 "8-Jul-65" 45276140 1 -45300000 -45300000 6.700e+08 67100000 8
3 "9-Jul-65" 1.08e+08 0 45300000 0 1.210e+09 -1.710e+08 8
3 "10-Jul-65" -41325336 0 1.080e+08 0 1.360e+09 81300000 8
3 "11-Jul-65" 38053696 1 -41300000 -41300000 1.400e+09 3.400e+08 8
4 "28-Jun-65" 1.23e+08 1 -1.750e+08 -1.750e+08 1.120e+09 -3.490e+08 1
4 "29-Jun-65" 2.69e+08 0 1.230e+08 0 1.120e+09 95900000 1
4 "30-Jun-65" 1.64e+08 0 2.690e+08 0 1.530e+09 -6.730e+08 1
4 "1-Jul-65" 3.58e+08 0 1.640e+08 0 1.800e+09 9.680e+08 1
4 "2-Jul-65" 88482896 0 3.580e+08 0 1.680e+09 2.480e+09 1
4 "3-Jul-65" 2.84e+08 0 88500000 0 2.190e+09 -4.770e+08 1
4 "4-Jul-65" 6.24e+08 0 2.840e+08 0 2.560e+09 1.810e+08 1
4 "5-Jul-65" 5.01e+08 0 6.240e+08 0 2.890e+09 -1.270e+09 1
4 "6-Jul-65" 6.36e+08 0 5.010e+08 0 3.550e+09 -1.230e+09 1
4 "7-Jul-65" 5.77e+08 0 6.360e+08 0 4.190e+09 8.780e+08 1
4 "8-Jul-65" 5.45e+08 0 5.760e+08 0 4.210e+09 1.320e+09 1
4 "9-Jul-65" 2.54e+08 0 5.450e+08 0 4.500e+09 1.550e+09 1
4 "10-Jul-65" 1.00e+09 0 2.540e+08 0 5.130e+09 -1.850e+09 1
4 "11-Jul-65" 9.70e+08 0 1.000e+09 0 5.710e+09 -2.790e+08 1
5 "28-Jun-65" -1.12e+08 1 -29400000 -29400000 95100000 53500000 8
5 "29-Jun-65" -6790873 1 -1.120e+08 -1.120e+08 1.090e+08 -2.740e+08 8
5 "30-Jun-65" -86812000 1 -6790873 -6790873 -7266488 -1.010e+08 8
5 "1-Jul-65" -647313.4 1 -86800000 -86800000 -8355161 -95700000 8
5 "2-Jul-65" 26155216 1 -647313.4 -647313.4 -74900000 -78500000 8
5 "3-Jul-65" -34517112 0 26200000 0 -54500000 -82300000 8
5 "4-Jul-65" 17348104 1 -34500000 -34500000 -32800000 -89400000 8
5 "5-Jul-65" 16387716 0 17300000 0 2.920e+08 64100000 8
5 "6-Jul-65" 35038616 0 16400000 0 2.970e+08 -1.460e+08 8
5 "7-Jul-65" -22681022 0 35000000 0 3.530e+08 3.320e+08 8
5 "8-Jul-65" -35172208 1 -22700000 -22700000 3.580e+08 -1.730e+08 8
5 "9-Jul-65" 43069424 1 -35200000 -35200000 3.730e+08 -1.290e+08 8
5 "10-Jul-65" 70959152 0 43100000 0 4.370e+08 -1.460e+08 8
5 "11-Jul-65" -2534897 0 71000000 0 3.900e+08 -19500000 8
6 "28-Jun-65" 35130608 0 1351709 0 72900000 23200000 3
6 "29-Jun-65" -3168344.5 0 35100000 0 68000000 3929789 3
6 "30-Jun-65" 1051860.6 1 -3168345 -3168345 71500000 -14700000 3
6 "1-Jul-65" -181081.5 0 1051861 0 73200000 -5531294 3
end