Research Article
Parameter Estimation and Applications of the Weibull Distribution for Strength Data of Glass Fiber
Table 1
The bias and MSE of five estimation methods for
.
| | | | | | n | Method | | | | | | | | |
| 10 | CDFM | Bias | 0.053 | 0.042 | 0.097 | 0.004 | 0.240 | 0.001 | 0.313 | 0.002 | | | MSE | 0.129 | 0.123 | 0.495 | 0.029 | 2.148 | 0.007 | 4.564 | 0.003 | | ML | Bias | 0.169 | 0.016 | 0.327 | 0.007 | 0.703 | 0.006 | 1.020 | 0.006 | | | MSE | 0.152 | 0.112 | 0.589 | 0.027 | 2.534 | 0.007 | 5.561 | 0.003 | | LM | Bias | 0.056 | 0.029 | 0.103 | 0.011 | 0.294 | 0.003 | 0.445 | 0.002 | | | MSE | 0.110 | 0.112 | 0.424 | 0.028 | 1.939 | 0.007 | 4.367 | 0.003 | | PM | Bias | 0.507 | 0.016 | 0.981 | 0.015 | 1.988 | 0.012 | 2.842 | 0.009 | | | MSE | 1.344 | 0.153 | 4.762 | 0.038 | 20.94 | 0.009 | 41.75 | 0.004 | | MM | Bias | 0.167 | 0.020 | 0.182 | 0.008 | 0.420 | 0.004 | 0.660 | 0.003 | | | MSE | 0.131 | 0.113 | 0.441 | 0.028 | 2.155 | 0.007 | 5.066 | 0.003 |
| 20 | CDFM | Bias | 0.029 | 0.021 | 0.045 | 0.002 | 0.094 | 0.001 | 0.137 | 0.001 | | | MSE | 0.051 | 0.061 | 0.192 | 0.015 | 0.816 | 0.004 | 1.851 | 0.002 | | ML | Bias | 0.080 | 0.010 | 0.153 | 0.004 | 0.310 | 0.002 | 0.441 | 0.003 | | | MSE | 0.050 | 0.057 | 0.187 | 0.014 | 0.794 | 0.003 | 1.761 | 0.002 | | LM | Bias | 0.029 | 0.012 | 0.048 | 0.006 | 0.121 | 0.000 | 0.185 | 0.001 | | | MSE | 0.045 | 0.057 | 0.156 | 0.014 | 0.717 | 0.003 | 1.662 | 0.002 | | PM | Bias | 0.246 | 0.006 | 0.457 | 0.008 | 0.896 | 0.004 | 1.411 | 0.005 | | | MSE | 0.361 | 0.085 | 1.373 | 0.021 | 5.238 | 0.005 | 12.95 | 0.002 | | MM | Bias | 0.091 | 0.012 | 0.088 | 0.005 | 0.176 | 0.001 | 0.278 | 0.002 | | | MSE | 0.055 | 0.058 | 0.156 | 0.014 | 0.747 | 0.003 | 1.814 | 0.002 |
| 30 | CDFM | Bias | 0.016 | 0.015 | 0.026 | 0.001 | 0.069 | 0.001 | 0.068 | 0.000 | | | MSE | 0.031 | 0.040 | 0.122 | 0.010 | 0.498 | 0.002 | 1.121 | 0.001 | | ML | Bias | 0.050 | 0.008 | 0.096 | 0.003 | 0.206 | 0.001 | 0.279 | 0.002 | | | MSE | 0.028 | 0.038 | 0.110 | 0.009 | 0.441 | 0.002 | 0.986 | 0.001 | | LM | Bias | 0.017 | 0.007 | 0.027 | 0.004 | 0.087 | 0.000 | 0.109 | 0.000 | | | MSE | 0.027 | 0.038 | 0.100 | 0.009 | 0.430 | 0.002 | 1.003 | 0.001 | | PM | Bias | 0.141 | 0.006 | 0.271 | 0.006 | 0.570 | 0.003 | 0.823 | 0.003 | | | MSE | 0.166 | 0.055 | 0.625 | 0.014 | 2.635 | 0.003 | 5.884 | 0.002 | | MM | Bias | 0.062 | 0.009 | 0.054 | 0.004 | 0.123 | 0.000 | 0.172 | 0.001 | | | MSE | 0.034 | 0.039 | 0.099 | 0.009 | 0.437 | 0.002 | 1.075 | 0.001 |
| 40 | CDFM | Bias | 0.011 | 0.015 | 0.031 | 0.001 | 0.092 | 0.001 | 0.162 | 0.002 | | | MSE | 0.023 | 0.031 | 0.095 | 0.007 | 0.377 | 0.002 | 0.857 | 0.001 | | ML | Bias | 0.041 | 0.007 | 0.087 | 0.001 | 0.188 | 0.002 | 0.286 | 0.002 | | | MSE | 0.021 | 0.029 | 0.084 | 0.007 | 0.350 | 0.002 | 0.747 | 0.001 | | LM | Bias | 0.018 | 0.003 | 0.033 | 0.002 | 0.103 | 0.001 | 0.178 | 0.002 | | | MSE | 0.019 | 0.029 | 0.077 | 0.007 | 0.328 | 0.002 | 0.763 | 0.001 | | PM | Bias | 0.095 | 0.010 | 0.227 | 0.004 | 0.442 | 0.004 | 0.748 | 0.001 | | | MSE | 0.100 | 0.044 | 0.524 | 0.011 | 1.692 | 0.003 | 3.805 | 0.001 | | MM | Bias | 0.056 | 0.010 | 0.054 | 0.002 | 0.128 | 0.001 | 0.222 | 0.002 | | | MSE | 0.026 | 0.030 | 0.077 | 0.007 | 0.332 | 0.002 | 0.813 | 0.001 |
| 50 | CDFM | Bias | 0.008 | 0.007 | 0.020 | 0.001 | 0.035 | 0.000 | 0.048 | 0.001 | | | MSE | 0.017 | 0.024 | 0.070 | 0.006 | 0.288 | 0.001 | 0.622 | 0.001 | | ML | Bias | 0.028 | 0.003 | 0.060 | 0.000 | 0.118 | 0.001 | 0.168 | 0.001 | | | MSE | 0.015 | 0.022 | 0.059 | 0.006 | 0.240 | 0.001 | 0.526 | 0.001 | | LM | Bias | 0.009 | 0.006 | 0.020 | 0.001 | 0.045 | 0.001 | 0.070 | 0.000 | | | MSE | 0.015 | 0.023 | 0.056 | 0.006 | 0.245 | 0.001 | 0.557 | 0.001 | | PM | Bias | 0.081 | 0.001 | 0.167 | 0.003 | 0.329 | 0.002 | 0.485 | 0.002 | | | MSE | 0.079 | 0.034 | 0.313 | 0.009 | 1.237 | 0.002 | 2.718 | 0.001 | | MM | Bias | 0.038 | 0.004 | 0.035 | 0.001 | 0.065 | 0.001 | 0.106 | 0.001 | | | MSE | 0.019 | 0.023 | 0.055 | 0.006 | 0.244 | 0.001 | 0.591 | 0.001 |
| 60 | CDFM | Bias | 0.010 | 0.015 | 0.008 | 0.000 | 0.032 | 0.001 | 0.029 | 0.000 | | | MSE | 0.014 | 0.019 | 0.055 | 0.005 | 0.225 | 0.001 | 0.496 | 0.001 | | ML | Bias | 0.028 | 0.009 | 0.040 | 0.002 | 0.100 | 0.002 | 0.125 | 0.000 | | | MSE | 0.012 | 0.018 | 0.043 | 0.005 | 0.189 | 0.001 | 0.402 | 0.001 | | LM | Bias | 0.015 | 0.003 | 0.008 | 0.003 | 0.043 | 0.001 | 0.045 | 0.001 | | | MSE | 0.012 | 0.018 | 0.043 | 0.005 | 0.196 | 0.001 | 0.433 | 0.001 | | PM | Bias | 0.065 | 0.012 | 0.124 | 0.002 | 0.237 | 0.003 | 0.416 | −0.002 | | | MSE | 0.055 | 0.029 | 0.254 | 0.007 | 0.907 | 0.002 | 2.044 | 0.001 | | MM | Bias | 0.040 | 0.012 | 0.020 | 0.002 | 0.061 | 0.002 | 0.075 | 0.000 | | | MSE | 0.017 | 0.019 | 0.041 | 0.005 | 0.196 | 0.001 | 0.453 | 0.001 |
| 70 | CDFM | Bias | 0.006 | 0.008 | 0.010 | 0.000 | 0.052 | 0.002 | 0.046 | 0.000 | | | MSE | 0.011 | 0.017 | 0.049 | 0.004 | 0.217 | 0.001 | 0.452 | 0.000 | | ML | Bias | 0.021 | 0.004 | 0.035 | 0.001 | 0.108 | 0.002 | 0.134 | 0.001 | | | MSE | 0.009 | 0.016 | 0.039 | 0.004 | 0.180 | 0.001 | 0.374 | 0.000 | | LM | Bias | 0.007 | 0.002 | 0.008 | 0.002 | 0.058 | 0.002 | 0.062 | 0.000 | | | MSE | 0.010 | 0.016 | 0.039 | 0.004 | 0.184 | 0.001 | 0.397 | 0.000 | | PM | Bias | 0.058 | 0.003 | 0.118 | 0.004 | 0.233 | 0.003 | 0.363 | 0.002 | | | MSE | 0.048 | 0.026 | 0.206 | 0.006 | 0.787 | 0.001 | 1.807 | 0.001 | | MM | Bias | 0.028 | 0.005 | 0.017 | 0.002 | 0.072 | 0.002 | 0.088 | 0.000 | | | MSE | 0.014 | 0.017 | 0.038 | 0.004 | 0.183 | 0.001 | 0.415 | 0.000 |
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