Research Article
Parameter Estimation and Applications of the Weibull Distribution for Strength Data of Glass Fiber
Table 2
The bias and MSE of five estimation methods for
, α = 1,2,4,6.
| | | | | | n | Method | | | | | | | | |
| 10 | CDFM | Bias | 0.046 | 0.079 | 0.107 | 0.014 | 0.203 | 0.003 | 0.285 | 0.004 | | | MSE | 0.131 | 0.482 | 0.507 | 0.116 | 2.100 | 0.029 | 4.535 | 0.013 | | ML | Bias | 0.169 | 0.036 | 0.341 | 0.009 | 0.666 | 0.014 | 0.980 | 0.011 | | | MSE | 0.154 | 0.461 | 0.611 | 0.109 | 2.411 | 0.028 | 5.371 | 0.012 | | LM | Bias | 0.055 | 0.055 | 0.114 | 0.016 | 0.264 | 0.006 | 0.414 | 0.004 | | | MSE | 0.112 | 0.460 | 0.435 | 0.111 | 1.890 | 0.028 | 4.362 | 0.012 | | PM | Bias | 0.506 | 0.037 | 1.004 | 0.025 | 2.001 | 0.026 | 2.825 | 0.020 | | | MSE | 1.310 | 0.635 | 5.146 | 0.151 | 22.20 | 0.039 | 46.90 | 0.017 | | MM | Bias | 0.167 | 0.042 | 0.194 | 0.012 | 0.387 | 0.009 | 0.629 | 0.007 | | | MSE | 0.134 | 0.461 | 0.454 | 0.110 | 2.072 | 0.028 | 5.072 | 0.012 |
| 20 | CDFM | Bias | 0.022 | 0.033 | 0.042 | 0.006 | 0.107 | 0.001 | 0.131 | 0.002 | | | MSE | 0.050 | 0.244 | 0.196 | 0.057 | 0.818 | 0.014 | 1.786 | 0.007 | | ML | Bias | 0.074 | 0.009 | 0.149 | 0.006 | 0.312 | 0.006 | 0.454 | 0.005 | | | MSE | 0.048 | 0.228 | 0.191 | 0.054 | 0.804 | 0.014 | 1.754 | 0.006 | | LM | Bias | 0.025 | 0.035 | 0.044 | 0.009 | 0.129 | 0.002 | 0.188 | 0.002 | | | MSE | 0.043 | 0.230 | 0.161 | 0.055 | 0.722 | 0.014 | 1.648 | 0.006 | | PM | Bias | 0.232 | 0.011 | 0.447 | 0.013 | 0.929 | 0.013 | 1.357 | 0.009 | | | MSE | 0.351 | 0.342 | 1.320 | 0.081 | 5.424 | 0.021 | 12.00 | 0.009 | | MM | Bias | 0.088 | 0.014 | 0.084 | 0.007 | 0.183 | 0.004 | 0.285 | 0.003 | | | MSE | 0.053 | 0.232 | 0.160 | 0.055 | 0.751 | 0.014 | 1.812 | 0.006 |
| 30 | CDFM | Bias | 0.015 | 0.026 | 0.031 | 0.005 | 0.055 | 0.000 | 0.096 | 0.000 | | | MSE | 0.030 | 0.160 | 0.123 | 0.040 | 0.485 | 0.010 | 1.126 | 0.004 | | ML | Bias | 0.049 | 0.011 | 0.099 | 0.002 | 0.195 | 0.004 | 0.298 | 0.002 | | | MSE | 0.028 | 0.149 | 0.110 | 0.038 | 0.434 | 0.009 | 1.005 | 0.004 | | LM | Bias | 0.016 | 0.019 | 0.031 | 0.004 | 0.071 | 0.002 | 0.126 | 0.000 | | | MSE | 0.027 | 0.151 | 0.100 | 0.038 | 0.414 | 0.009 | 1.004 | 0.004 | | PM | Bias | 0.138 | 0.010 | 0.282 | 0.008 | 0.561 | 0.008 | 0.887 | 0.005 | | | MSE | 0.159 | 0.221 | 0.640 | 0.056 | 2.712 | 0.014 | 6.070 | 0.006 | | MM | Bias | 0.062 | 0.015 | 0.056 | 0.003 | 0.105 | 0.003 | 0.185 | 0.001 | | | MSE | 0.034 | 0.154 | 0.099 | 0.038 | 0.419 | 0.009 | 1.077 | 0.004 |
| 40 | CDFM | Bias | 0.014 | 0.004 | 0.019 | 0.003 | 0.031 | 0.006 | 0.058 | 0.000 | | | MSE | 0.020 | 0.121 | 0.086 | 0.027 | 0.318 | 0.007 | 0.827 | 0.003 | | ML | Bias | 0.040 | 0.012 | 0.067 | 0.002 | 0.137 | 0.002 | 0.211 | 0.002 | | | MSE | 0.020 | 0.114 | 0.073 | 0.026 | 0.267 | 0.007 | 0.704 | 0.003 | | LM | Bias | 0.012 | 0.036 | 0.019 | 0.003 | 0.041 | 0.004 | 0.091 | 0.000 | | | MSE | 0.019 | 0.117 | 0.070 | 0.026 | 0.267 | 0.007 | 0.754 | 0.003 | | PM | Bias | 0.109 | 0.024 | 0.185 | 0.008 | 0.412 | 0.001 | 0.586 | 0.004 | | | MSE | 0.095 | 0.172 | 0.375 | 0.040 | 1.577 | 0.010 | 3.699 | 0.005 | | MM | Bias | 0.045 | 0.014 | 0.038 | 0.003 | 0.066 | 0.004 | 0.135 | 0.001 | | | MSE | 0.025 | 0.118 | 0.069 | 0.026 | 0.265 | 0.007 | 0.800 | 0.003 |
| 50 | CDFM | Bias | 0.012 | 0.019 | 0.017 | 0.004 | 0.035 | 0.001 | 0.062 | 0.001 | | | MSE | 0.018 | 0.097 | 0.071 | 0.023 | 0.279 | 0.006 | 0.619 | 0.003 | | ML | Bias | 0.031 | 0.010 | 0.058 | 0.001 | 0.116 | 0.003 | 0.175 | 0.002 | | | MSE | 0.015 | 0.091 | 0.060 | 0.022 | 0.234 | 0.006 | 0.528 | 0.002 | | LM | Bias | 0.011 | 0.008 | 0.017 | 0.002 | 0.045 | 0.002 | 0.085 | 0.000 | | | MSE | 0.015 | 0.092 | 0.057 | 0.022 | 0.238 | 0.006 | 0.559 | 0.002 | | PM | Bias | 0.086 | 0.006 | 0.160 | 0.005 | 0.314 | 0.006 | 0.491 | 0.005 | | | MSE | 0.076 | 0.137 | 0.308 | 0.033 | 1.199 | 0.009 | 2.727 | 0.004 | | MM | Bias | 0.040 | 0.012 | 0.033 | 0.001 | 0.065 | 0.003 | 0.123 | 0.001 | | | MSE | 0.020 | 0.095 | 0.056 | 0.022 | 0.238 | 0.006 | 0.596 | 0.002 |
| 60 | CDFM | Bias | 0.011 | 0.013 | 0.012 | 0.005 | 0.026 | 0.003 | 0.044 | 0.002 | | | MSE | 0.015 | 0.076 | 0.057 | 0.019 | 0.228 | 0.005 | 0.546 | 0.002 | | ML | Bias | 0.025 | 0.005 | 0.052 | 0.001 | 0.093 | 0.005 | 0.146 | 0.003 | | | MSE | 0.012 | 0.069 | 0.046 | 0.018 | 0.189 | 0.005 | 0.453 | 0.002 | | LM | Bias | 0.011 | 0.009 | 0.016 | 0.000 | 0.036 | 0.004 | 0.061 | 0.001 | | | MSE | 0.012 | 0.071 | 0.045 | 0.018 | 0.197 | 0.005 | 0.473 | 0.002 | | PM | Bias | 0.075 | 0.009 | 0.126 | 0.000 | 0.268 | 0.007 | 0.420 | 0.003 | | | MSE | 0.062 | 0.114 | 0.237 | 0.028 | 0.966 | 0.007 | 2.266 | 0.003 | | MM | Bias | 0.035 | 0.008 | 0.030 | 0.000 | 0.053 | 0.004 | 0.091 | 0.002 | | | MSE | 0.016 | 0.073 | 0.044 | 0.018 | 0.197 | 0.005 | 0.493 | 0.002 |
| 70 | CDFM | Bias | 0.006 | 0.013 | 0.006 | 0.004 | 0.024 | 0.004 | 0.066 | 0.002 | | | MSE | 0.013 | 0.068 | 0.046 | 0.015 | 0.200 | 0.004 | 0.461 | 0.002 | | ML | Bias | 0.021 | 0.005 | 0.035 | 0.001 | 0.078 | 0.005 | 0.146 | 0.000 | | | MSE | 0.010 | 0.064 | 0.037 | 0.014 | 0.155 | 0.004 | 0.389 | 0.002 | | LM | Bias | 0.009 | 0.007 | 0.006 | 0.000 | 0.036 | 0.004 | 0.078 | 0.002 | | | MSE | 0.011 | 0.064 | 0.036 | 0.014 | 0.170 | 0.004 | 0.417 | 0.002 | | PM | Bias | 0.059 | 0.009 | 0.109 | 0.004 | 0.194 | 0.009 | 0.324 | 0.000 | | | MSE | 0.050 | 0.097 | 0.186 | 0.022 | 0.737 | 0.006 | 1.515 | 0.003 | | MM | Bias | 0.030 | 0.008 | 0.016 | 0.000 | 0.051 | 0.004 | 0.100 | 0.001 | | | MSE | 0.014 | 0.067 | 0.036 | 0.014 | 0.169 | 0.004 | 0.441 | 0.002 |
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