诚心邀请，请教数值分析或数据挖掘高手
大家好：最近老板布置一个任务，对我来说就是IM(impossible   mission),:).如果大家有兴趣，我把任务描述一下：
A B C D E Ratio
0.075 8.641 1.906 6.649 82.729 180
0.097 9.090 2.026 6.852 81.936 192
0.086 8.736 1.927 6.618 82.633 184
0.034 14.550 1.243 4.978 79.195 283
0.047 14.635 1.244 4.586 79.487 282
0.034 14.701 1.249 5.034 78.982 286
0.038 14.761 1.215 4.767 79.220 287
6.775 62.070 7.766 8.677 14.712 7789
6.027 59.546 7.438 8.519 18.470 5298
6.477 61.458 7.688 8.810 15.567 6748
6.617 62.048 7.779 8.890 14.666 7509
16.017 45.219 4.805 11.903 22.056 3827
1.518 2.440 0.859 10.293 84.889 67
1.272 2.080 0.727 8.889 87.031 53
0.839 1.334 0.477 7.092 90.257 34
16.012 45.204 4.803 11.899 22.082 3827
0.021 1.415 0.925 7.992 89.646 45
0.115 10.969 1.883 10.736 76.297 207
0.106 13.379 2.642 10.770 73.104 308
2.864 79.304 0.835 1.061 15.936 6839
0.211 35.754 6.357 11.471 46.207 1209
0.233 9.904 1.599 4.120 84.145 187
0.219 9.293 1.496 3.586 85.407 171
0.218 9.553 1.495 3.467 85.266 179
0.229 10.138 1.633 4.200 83.801 191
0.160 97.679 0.362 0.109 1.689 71653
0.147 97.234 0.370 0.955 1.294 96858
0.352 73.037 6.579 7.027 13.004 10317
0.283 73.869 5.215 5.968 14.665 8051
0.029 0.036 0.010 0.715 99.210 1
0.017 0.000 0.005 2.129 97.849 1
0.026 0.052 0.012 0.526 99.384 2
2.664 46.045 10.286 20.890 20.115 5238
6.571 41.757 9.683 23.393 18.596 5240
7.302 47.444 8.011 16.450 20.793 5305
13.841 56.975 2.356 7.183 19.645 5357
2.794 55.096 8.782 13.137 20.191 5380
0.948 51.797 10.097 16.314 20.843 5393
10.565 55.640 4.475 9.214 20.106 5421
7.979 48.396 8.216 15.249 20.160 5443
21.450 43.907 9.097 9.497 16.049 5449
11.567 55.398 2.735 9.641 20.659 5536
0.821 51.784 10.144 16.403 20.848 5553
0.271 82.789 7.368 6.657 2.914 80925
0.746 83.802 6.796 5.186 3.470 83683
0.159 70.716 10.495 14.068 4.563 85783
2.052 49.864 17.241 22.859 7.984 87673
0.150 68.182 10.192 14.107 7.368 96611
0.567 0.150 0.054 0.296 98.933 6
0.170 5.421 0.825 7.301 86.283 114
0.006 0.271 0.297 4.216 95.211 11
0.080 9.402 2.000 9.642 78.876 210
6.556 23.721 3.420 7.778 58.525 681
0.000 0.860 0.230 0.840 98.070 13
0.058 4.981 0.515 2.049 92.396 86
0.062 0.482 0.176 1.754 97.526 15
0.021 1.027 0.958 5.588 92.405 35
7.131 11.721 2.401 7.189 71.558 309
0.130 18.661 4.803 10.766 65.639 457
0.034 0.974 0.164 4.206 94.623 20
0.075 59.639 5.061 10.112 25.113 3453
0.313 5.447 2.056 8.306 83.877 115
0.547 3.313 2.784 11.033 82.324 115
0.063 4.214 1.799 10.376 83.548 116
1.531 5.673 1.469 4.105 87.223 117
1.377 4.897 1.390 7.642 84.694 118
0.171 5.614 1.823 7.340 85.052 120
1.338 4.379 1.625 7.929 84.730 120
1.089 4.896 2.203 9.564 82.247 122
0.560 4.229 2.829 12.814 79.567 125
0.103 5.722 2.147 8.611 83.416 125
1.252 5.203 1.719 5.211 86.615 126
0.243 4.715 2.941 10.748 81.353 127
0.655 5.983 1.715 4.887 86.759 127
0.502 6.817 1.050 2.242 89.389 128
0.143 6.139 1.987 9.002 82.729 131
1.263 5.845 1.945 8.776 82.171 132
0.844 4.676 2.670 13.023 78.787 134
1.569 5.726 1.565 7.924 83.216 136
1.430 7.157 1.537 5.109 84.767 140
0.171 7.646 1.958 4.236 85.989 141
1.599 6.290 1.890 5.057 85.165 143
1.141 6.647 1.731 8.008 82.473 143
0.346 8.049 1.458 3.541 86.606 145
0.429 8.349 1.227 3.975 86.020 149
0.817 5.966 3.153 11.234 78.830 152
0.952 5.529 2.829 13.212 77.478 155
1.987 6.359 1.825 7.139 82.690 165
1.560 7.105 2.180 5.383 83.772 171
1.660 7.857 2.124 10.303 78.057 176
1.255