Research Article
Statistical Analysis of a Weibull Extension with Bathtub-Shaped Failure Rate Function
Table 4
Comparison of point estimations for
(above),
(below) with true values
.
| | | MLE | MOM | MMOM | IMOM | MIM | Mean | MSE | Mean | MSE | Mean | MSE | Mean | MSE | Mean | MSE |
| 10 | 8 | 1.3251 | 0.4554 | 1.5849 | 1.0819 | 1.2588 | 0.4836 | 1.1701 | 0.3111 | 1.0034 | 0.2089 | 0.8921 | 0.1787 | 0.7928 | 0.2181 | 0.9077 | 0.1686 | 0.9427 | 0.1575 | 1.0073 | 0.1378 | 9 | 1.2712 | 0.3197 | 1.4863 | 0.7610 | 1.2325 | 0.3735 | 1.1225 | 0.2122 | 0.9882 | 0.1534 | 0.9241 | 0.1555 | 0.8650 | 0.1889 | 0.9260 | 0.1477 | 0.9604 | 0.1452 | 0.9948 | 0.1214 | 10 | 1.1985 | 0.1949 | 1.3882 | 0.5076 | 1.1983 | 0.2675 | 1.0959 | 0.1413 | 0.9873 | 0.1082 | 0.9933 | 0.1416 | 0.9883 | 0.1848 | 0.9879 | 0.1493 | 1.0005 | 0.1231 | 1.0088 | 0.1019 |
| 15 | 12 | 1.1955 | 0.1955 | 1.3323 | 0.3511 | 1.1466 | 0.1862 | 1.0893 | 0.1334 | 0.9907 | 0.1037 | 0.9197 | 0.1146 | 0.8448 | 0.1350 | 0.9305 | 0.1090 | 0.9704 | 0.1023 | 1.0107 | 0.0937 | 13 | 1.1565 | 0.1576 | 1.2694 | 0.2795 | 1.1167 | 0.1622 | 1.0744 | 0.1209 | 0.9878 | 0.0975 | 0.9515 | 0.1028 | 0.9002 | 0.1180 | 0.9567 | 0.0984 | 0.9746 | 0.0929 | 1.0016 | 0.0837 | 14 | 1.1349 | 0.1215 | 1.2318 | 0.2377 | 1.1073 | 0.1404 | 1.0650 | 0.0798 | 0.9887 | 0.0655 | 0.9629 | 0.0963 | 0.9346 | 0.1099 | 0.9642 | 0.0931 | 0.9784 | 0.0793 | 0.9944 | 0.0704 | 15 | 1.1200 | 0.0923 | 1.2292 | 0.2030 | 1.1257 | 0.1316 | 1.0525 | 0.0682 | 0.9858 | 0.0579 | 0.9853 | 0.0867 | 0.9814 | 0.1068 | 0.9832 | 0.0891 | 0.9906 | 0.0808 | 0.9960 | 0.0715 |
| 20 | 17 | 1.1305 | 0.1007 | 1.2089 | 0.1668 | 1.0958 | 0.1048 | 1.0673 | 0.0804 | 1.0023 | 0.0669 | 0.9503 | 0.0732 | 0.9069 | 0.0836 | 0.9569 | 0.0716 | 0.9717 | 0.0676 | 0.9940 | 0.0625 | 18 | 1.1028 | 0.0834 | 1.1752 | 0.1409 | 1.0781 | 0.0938 | 1.0492 | 0.0601 | 0.9905 | 0.0516 | 0.9621 | 0.0702 | 0.9287 | 0.0785 | 0.9629 | 0.0686 | 0.9836 | 0.0662 | 0.9991 | 0.0608 | 19 | 1.0948 | 0.0682 | 1.1685 | 0.1215 | 1.0867 | 0.0841 | 1.0450 | 0.0524 | 0.9915 | 0.0456 | 0.9716 | 0.0575 | 0.9502 | 0.0659 | 0.9691 | 0.0581 | 0.9857 | 0.0637 | 0.9953 | 0.0582 | 20 | 1.0921 | 0.0599 | 1.1683 | 0.1197 | 1.0978 | 0.0854 | 1.0371 | 0.0519 | 0.9892 | 0.0463 | 0.9974 | 0.0614 | 0.9938 | 0.0707 | 0.9954 | 0.0625 | 1.0030 | 0.0574 | 1.0061 | 0.0525 |
| 25 | 22 | 1.0801 | 0.0626 | 1.1397 | 0.0979 | 1.0597 | 0.0692 | 1.0399 | 0.0528 | 0.9925 | 0.0468 | 0.9624 | 0.0508 | 0.9294 | 0.0576 | 0.9631 | 0.0508 | 0.9824 | 0.0495 | 0.9968 | 0.0463 | 23 | 1.0782 | 0.0524 | 1.1362 | 0.0852 | 1.0644 | 0.0607 | 1.0358 | 0.0459 | 0.9917 | 0.0411 | 0.9746 | 0.0499 | 0.9507 | 0.0561 | 0.9741 | 0.0502 | 0.9848 | 0.0468 | 0.9952 | 0.0437 | 24 | 1.0789 | 0.0523 | 1.1273 | 0.0823 | 1.0656 | 0.0609 | 1.0489 | 0.0454 | 1.0075 | 0.0398 | 0.9795 | 0.0486 | 0.9649 | 0.0531 | 0.9781 | 0.0480 | 0.9876 | 0.0463 | 0.9940 | 0.0429 | 25 | 1.0634 | 0.0405 | 1.1251 | 0.0754 | 1.0725 | 0.0572 | 1.0267 | 0.0397 | 0.9893 | 0.0366 | 1.0019 | 0.0464 | 0.9994 | 0.0531 | 1.0007 | 0.0481 | 1.0136 | 0.0423 | 1.0158 | 0.0395 |
| 30 | 27 | 1.0679 | 0.0445 | 1.1110 | 0.0683 | 1.0494 | 0.0508 | 1.0310 | 0.0387 | 0.9934 | 0.0351 | 0.9775 | 0.0449 | 0.9536 | 0.0483 | 0.9775 | 0.0441 | 0.9831 | 0.0409 | 0.9933 | 0.0387 | 28 | 1.0649 | 0.0399 | 1.1101 | 0.0617 | 1.0556 | 0.0467 | 1.0293 | 0.0342 | 0.9939 | 0.0312 | 0.9755 | 0.0408 | 0.9590 | 0.0451 | 0.9756 | 0.0412 | 0.9846 | 0.0389 | 0.9922 | 0.0367 | 29 | 1.0606 | 0.0379 | 1.0957 | 0.0572 | 1.0492 | 0.0451 | 1.0386 | 0.0352 | 1.0052 | 0.0317 | 0.9845 | 0.0404 | 0.9746 | 0.0425 | 0.9839 | 0.0395 | 0.9860 | 0.0370 | 0.9909 | 0.0349 | 30 | 1.0549 | 0.0315 | 1.1104 | 0.0593 | 1.0677 | 0.0464 | 1.0159 | 0.0298 | 0.9853 | 0.0282 | 1.0014 | 0.0373 | 0.9980 | 0.0421 | 0.9992 | 0.0389 | 1.0046 | 0.0368 | 1.0065 | 0.0348 |
|
|