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视频教学里面板数据那章2.11.8节中仅保留六年的连续样本里，只说了怎么删除所有退市的和部分资料缺失的部分没有说明怎么才能只删除数据缺失而保留退市企业的资料？哪位大神给个程序
pp Freq. Percent Cum.
......1111 300,504 13.75 13.75
1111111111 290,600 13.30 27.05
...1111111 121,023 5.54 32.59
.....11111 118,535 5.42 38.02
........11 91,664 4.20 42.21
....111111 88,350 4.04 46.25
.......111 85,032 3.89 50.15
111111.... 73,314 3.36 53.50
111....... 64,299 2.94 56.44
..11111111 59,344 2.72 59.16
.........1 57,960 2.65 61.81
.111111111 52,110 2.38 64.20
11111..... 46,585 2.13 66.33
1111...... 38,724 1.77 68.10
111111111. 36,225 1.66 69.76
11........ 35,036 1.60 71.36
1111111... 28,112 1.29 72.65
......1... 26,356 1.21 73.85
1......... 26,322 1.20 75.06
......111. 24,798 1.13 76.19
11111111.. 24,488 1.12 77.32
...111.... 21,792 1.00 78.31
......11.. 18,580 0.85 79.16
.11111.... 14,060 0.64 79.81
...11..... 12,522 0.57 80.38
..1111.... 12,496 0.57 80.95
......1.11 11,907 0.54 81.50
.11....... 11,816 0.54 82.04
....11.... 11,570 0.53 82.57
...111111. 10,338 0.47 83.04
.....1.... 10,260 0.47 83.51
.1111..... 9,308 0.43 83.94
.....1111. 9,060 0.41 84.35
...11111.. 8,225 0.38 84.73
..1....... 7,639 0.35 85.08
...1111... 7,540 0.35 85.42
.....111.. 7,161 0.33 85.75
..111..... 7,098 0.32 86.07
.111...... 6,933 0.32 86.39
....11111. 6,800 0.31 86.70
.1........ 6,747 0.31 87.01
...1...... 6,330 0.29 87.30
.......11. 6,228 0.29 87.59
111111.111 6,075 0.28 87.86
....1..... 5,787 0.26 88.13
11.1111111 5,688 0.26 88.39
.11111111. 5,640 0.26 88.65
....1111.. 5,568 0.25 88.90
1.11111111 5,427 0.25 89.15
.....11... 5,118 0.23 89.38
..1111111. 4,949 0.23 89.61
..11...... 4,732 0.22 89.83
....111... 4,731 0.22 90.04
.111111... 4,584 0.21 90.25
........1. 4,446 0.20 90.46
..11111... 4,360 0.20 90.66
111.111111 4,311 0.20 90.85
11111.1111 4,257 0.19 91.05
.1111111.. 4,214 0.19 91.24
..111111.. 4,212 0.19 91.43
1111.11111 4,113 0.19 91.62
......1..1 3,994 0.18 91.81
......11.1 3,903 0.18 91.98
.......1.. 3,512 0.16 92.14
1111111.11 3,411 0.16 92.30
11111.1... 3,186 0.15 92.45
...1.11111 3,150 0.14 92.59
11111111.1 3,096 0.14 92.73
1..1111111 3,016 0.14 92.87
...11.1111 2,856 0.13 93.00
....1.1111 2,635 0.12 93.12
...111.111 2,628 0.12 93.24
.....1.111 2,604 0.12 93.36
111...1111 2,310 0.11 93.47
1.1....... 2,102 0.10 93.56
1111..1... 2,090 0.10 93.66
1111..1111 2,064 0.09 93.75
.1.1111111 2,008 0.09 93.84
111..11111 1,984 0.09 93.94
...1..1111 1,880 0.09 94.02
1.1111.... 1,860 0.09 94.11
11.111.... 1,810 0.08 94.19
..1.111111 1,771 0.08 94.27
....11.111 1,695 0.08 94.35
111.1..... 1,652 0.08 94.42
111.11.... 1,625 0.07 94.50
1111.1.... 1,600 0.07 94.57
111...1... 1,560 0.07 94.64
111111.1.. 1,491 0.07 94.71
1.111..... 1,440 0.07 94.78
11....1111 1,422 0.07 94.84
.....11.11 1,404 0.06 94.91
11.11..... 1,392 0.06 94.97
.11111.111 1,384 0.06 95.03
1.....1111 1,365 0.06 95.10
......1.1. 1,308 0.06 95.16
11.1...... 1,308 0.06 95.22
11..111111 1,264 0.06 95.27
..11.11111 1,232 0.06 95.33
.....111.1 1,228 0.06 95.39
1111111.1. 1,216 0.06 95.44
1.11...... 1,203 0.06 95.50
111111.11. 1,200 0.05 95.55
..1111.111 1,162 0.05 95.60
1...111111 1,155 0.05 95.66
...1111.11 1,140 0.05 95.71
.11.111111 1,128 0.05 95.76
...11111.1 1,122 0.05 95.81
..111.1111 1,113 0.05 95.86
.......1.1 1,096 0.05 95.91
111111..11 1,088 0.05 95.96
1....11111 1,068 0.05 96.01
1111111..1 1,032 0.05 96.06
11...11111 1,029 0.05 96.11
....111.11 1,000 0.05 96.15
.111.11111 992 0.05 96.20
11111.11.. 959 0.04 96.24
..1..11111 930 0.04 96.28
1111.11... 924 0.04 96.33
11111.111. 912 0.04 96.37
..1...1111 910 0.04 96.41
....1111.1 875 0.04 96.45
.....1..11 867 0.04 96.49
111..1.... 836 0.04 96.53
111111...1 833 0.04 96.57
.1111.1111 808 0.04 96.60
..11..1111 798 0.04 96.64
11.1111... 792 0.04 96.68
11....1... 783 0.04 96.71
1111.1111. 752 0.03 96.75
...111..11 750 0.03 96.78
1.....1... 740 0.03 96.81
1..111.... 728 0.03 96.85
1.1111111. 728 0.03 96.88
..11111.11 721 0.03 96.91
1.11111... 714 0.03 96.95
...111.1.. 668 0.03 96.98
1.111111.. 651 0.03 97.01
111.111... 648 0.03 97.04
.111..1111 637 0.03 97.07
11.111111. 632 0.03 97.09
..111111.1 630 0.03 97.12
1..11..... 618 0.03 97.15
111.11111. 600 0.03 97.18
.1111111.1 584 0.03 97.21
...1.1.... 580 0.03 97.23
.1.111.... 580 0.03 97.26
.111111.11 568 0.03 97.29
.11...1111 564 0.03 97.31
111.1111.. 560 0.03 97.34
....11..11 556 0.03 97.36
.1....1111 550 0.03 97.39
.1111.1... 545 0.02 97.41
.11..11111 539 0.02 97.44
...11.1... 537 0.02 97.46
.1..111111 525 0.02 97.49
1111.111.. 525 0.02 97.51
.....11..1 516 0.02 97.53
1..1...... 506 0.02 97.56
11111...11 490 0.02 97.58
.....1...1 478 0.02 97.60
....1.1... 462 0.02 97.62
.1.11..... 459 0.02 97.64
1..111111. 448 0.02 97.66
111...111. 432 0.02 97.68
11.11111.. 427 0.02 97.70
...111.11. 425 0.02 97.72
.11.1..... 423 0.02 97.74
...11.111. 420 0.02 97.76
11..11.... 420 0.02 97.78
1111..111. 420 0.02 97.80
...11.11.. 408 0.02 97.82
11..1..... 402 0.02 97.84
.1.1...... 398 0.02 97.85
.111.1.... 396 0.02 97.87
...1111..1 385 0.02 97.89
...1..1... 382 0.02 97.91
.....1.11. 381 0.02 97.93
.11111..11 378 0.02 97.94
...111...1 376 0.02 97.96
.1...11111 372 0.02 97.98
111.....11 370 0.02 97.99
1..1111... 360 0.02 98.01
1111..11.. 360 0.02 98.03
.11.11.... 352 0.02 98.04
1..11111.. 348 0.02 98.06
111..11... 345 0.02 98.07
....1.111. 340 0.02 98.09
...1.1111. 340 0.02 98.11
.11...1... 336 0.02 98.12
....11...1 333 0.02 98.14
.....1.1.. 330 0.02 98.15
....11.1.. 330 0.02 98.17
...1.11... 330 0.02 98.18
1111....11 330 0.02 98.20
11111..111 328 0.02 98.21
111..1111. 315 0.01 98.23
111111..1. 308 0.01 98.24
...11..111 300 0.01 98.25
.111..1... 300 0.01 98.27
..1111.1.. 295 0.01 98.28
.11111.1.. 294 0.01 98.29
...1111.1. 290 0.01 98.31
....111..1 288 0.01 98.32
..11.1.... 288 0.01 98.33
11111....1 288 0.01 98.35
..1.1..... 282 0.01 98.36
..1111..11 282 0.01 98.37
.11111.11. 280 0.01 98.39
111...11.. 280 0.01 98.40
..1111.11. 276 0.01 98.41
.11..1.... 276 0.01 98.42
1...11.... 276 0.01 98.44
.1.1111... 275 0.01 98.45
....11.11. 272 0.01 98.46
...1.111.. 272 0.01 98.47
...11...11 272 0.01 98.49
..1.11.... 270 0.01 98.50
.1.111111. 266 0.01 98.51
11....111. 265 0.01 98.52
....1..111 264 0.01 98.54
11..11111. 259 0.01 98.55
111....111 258 0.01 98.56
1111...111 252 0.01 98.57
.....11.1. 249 0.01 98.58
..1111...1 245 0.01 98.59
..111.1... 240 0.01 98.60
11111.1.11 240 0.01 98.62
11...1.... 237 0.01 98.63
...1...111 236 0.01 98.64
..1...1... 234 0.01 98.65
1.11.11111 232 0.01 98.66
....1...11 225 0.01 98.67
1....1.... 222 0.01 98.68
1.....111. 220 0.01 98.69
....1.11.. 219 0.01 98.70
.111111..1 217 0.01 98.71
1..1.11111 217 0.01 98.72
1......111 216 0.01 98.73
.11.111... 215 0.01 98.74
..11.1111. 210 0.01 98.75
..11111..1 210 0.01 98.76
.111111.1. 210 0.01 98.77
11.1.11111 208 0.01 98.78
...1..111. 204 0.01 98.79
...11....1 204 0.01 98.80
11......11 204 0.01 98.80
111..111.. 204 0.01 98.81
1...1..... 200 0.01 98.82
11....11.. 200 0.01 98.83
...1....11 198 0.01 98.84
..11111.1. 198 0.01 98.85
11...1111. 192 0.01 98.86
.1111.111. 189 0.01 98.87
1.....11.. 189 0.01 98.88
111......1 188 0.01 98.88
.11111...1 186 0.01 98.89
.11...111. 185 0.01 98.90
11.....111 185 0.01 98.91
.1....1... 184 0.01 98.92
1111.111.1 184 0.01 98.93
1111..1.11 182 0.01 98.94
....111.1. 180 0.01 98.94
1...11111. 180 0.01 98.95
11.11111.1 176 0.01 98.96
11..1111.. 174 0.01 98.97
...1..11.. 171 0.01 98.98
..11..1... 171 0.01 98.98
..1..1.... 168 0.01 98.99
.1.11111.. 168 0.01 99.00
111.1.1... 165 0.01 99.01
...111..1. 160 0.01 99.01
..11.11... 160 0.01 99.02
1111.....1 160 0.01 99.03
..111.111. 156 0.01 99.04
.111.11... 155 0.01 99.04
1.......11 153 0.01 99.05
1.1111.111 152 0.01 99.06
..111.11.. 150 0.01 99.06
1...1111.. 150 0.01 99.07
11.......1 150 0.01 99.08
11..111... 150 0.01 99.08
11.11.1... 150 0.01 99.09
.111.111.. 144 0.01 99.10
..1.111... 140 0.01 99.10
1...111... 140 0.01 99.11
11.1..1111 140 0.01 99.12
111...1.11 138 0.01 99.12
1....111.. 136 0.01 99.13
11.1..1... 136 0.01 99.14
11.111.111 136 0.01 99.14
111.1.1111 136 0.01 99.15
11111.11.1 136 0.01 99.15
.1..11.... 135 0.01 99.16
1....1111. 135 0.01 99.17
11111.1.1. 133 0.01 99.17
...1.1.111 130 0.01 99.18
1.1...1... 129 0.01 99.18
..1....111 128 0.01 99.19
1.1.111111 128 0.01 99.20
1.111111.1 128 0.01 99.20
11.11.1111 128 0.01 99.21
111.11.111 128 0.01 99.21
.1..1..... 126 0.01 99.22
..1..1111. 125 0.01 99.23
....1....1 120 0.01 99.23
..11.111.. 120 0.01 99.24
.1111.11.. 120 0.01 99.24
.111.1111. 119 0.01 99.25
1.1..11111 119 0.01 99.25
1111.11..1 119 0.01 99.26
.....1..1. 116 0.01 99.26
....1.1.11 116 0.01 99.27
...1.111.1 115 0.01 99.27
.1111....1 115 0.01 99.28
..111..111 114 0.01 99.28
...1.....1 112 0.01 99.29
.1.11.1111 112 0.01 99.29
1.11111.11 112 0.01 99.30
1.1.1..... 111 0.01 99.31
..11..111. 110 0.01 99.31
...1..1.11 108 0.00 99.32
11111..1.. 108 0.00 99.32
..1.....11 105 0.00 99.32
.11.11111. 105 0.00 99.33
1....11... 105 0.00 99.33
11111..11. 105 0.00 99.34
1.11..1... 104 0.00 99.34
1.111.1111 104 0.00 99.35
1111.11.11 104 0.00 99.35
..111...11 100 0.00 99.36
.1....111. 100 0.00 99.36
.11....111 100 0.00 99.37
1........1 98 0.00 99.37
1..11111.1 98 0.00 99.38
1.11..1111 98 0.00 99.38
....11..1. 96 0.00 99.39
.11..1111. 96 0.00 99.39
.11.1111.. 96 0.00 99.39
1.11.1.... 96 0.00 99.40
11...11... 96 0.00 99.40
11...111.. 95 0.00 99.41
.1111..111 91 0.00 99.41
..1.1111.. 90 0.00 99.42
..1...111. 88 0.00 99.42
.1...1.... 88 0.00 99.42
.11..11... 88 0.00 99.43
1.1.11.... 88 0.00 99.43
11.1.1.... 88 0.00 99.44
11.1111.11 88 0.00 99.44
1.111.1... 85 0.00 99.44
..1...11.. 84 0.00 99.45
..1..11... 84 0.00 99.45
.1..111... 84 0.00 99.45
.1..11111. 84 0.00 99.46
.1.1.11111 84 0.00 99.46
111..1.111 84 0.00 99.47
11111.1..1 84 0.00 99.47
.1....11.. 81 0.00 99.47
...11.1.11 80 0.00 99.48
...11.11.1 80 0.00 99.48
..11..11.. 80 0.00 99.48
.11..111.. 80 0.00 99.49
111111.1.1 80 0.00 99.49
..111.1.11 78 0.00 99.50
.111..111. 78 0.00 99.50
.1111...11 78 0.00 99.50
1111...11. 78 0.00 99.51
1..11.1111 77 0.00 99.51
1..111.111 77 0.00 99.51
1111.1.11. 77 0.00 99.52
..1......1 76 0.00 99.52
.1..1111.. 75 0.00 99.52
..1.11111. 72 0.00 99.53
.11.1.1111 70 0.00 99.53
1.11111.1. 70 0.00 99.53
11....1.11 70 0.00 99.54
11.1.1111. 70 0.00 99.54
11.1111.1. 70 0.00 99.54
....1.11.1 68 0.00 99.55
..1...1.11 68 0.00 99.55
..11....11 68 0.00 99.55
.11...11.. 68 0.00 99.56
1..1..1111 66 0.00 99.56
11.111.1.. 66 0.00 99.56
1111..1..1 66 0.00 99.56
11111...1. 66 0.00 99.57
.111..11.. 65 0.00 99.57
.111.....1 64 0.00 99.57
111....1.. 64 0.00 99.58
111.111.11 64 0.00 99.58
1111.1.111 64 0.00 99.58
.....1.1.1 63 0.00 99.59
.11......1 63 0.00 99.59
11..11.111 63 0.00 99.59
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