====== MTBF(지수분포) 구간 추정의 계수표(정수중단) ====== ^ **고장수** $r$ ^ **60%** ^^ **80%** ^^ **90%** ^^ **95%** || ^::: ^ **상** ^ **하** ^ **상** ^ **하** ^ **상** ^ **하** ^ **상** ^ **하** ^ ^ **1** | 4.481 | 0.621 | 9.491 | 0.434 | 19.496 | 0.334 | 39.498 | 0.271 | ^ **2** | 2.426 | 0.668 | 3.761 | 0.514 | 5.628 | 0.422 | 8.257 | 0.359 | ^ **3** | 1.954 | 0.701 | 2.722 | 0.564 | 3.669 | 0.477 | 4.849 | 0.415 | ^ **4** | 1.742 | 0.725 | 2.293 | 0.599 | 2.928 | 0.516 | 3.670 | 0.456 | ^ **5** | 1.618 | 0.744 | 2.055 | 0.626 | 2.538 | 0.546 | 3.080 | 0.488 | ^ **6** | 1.537 | 0.759 | 1.904 | 0.647 | 2.296 | 0.571 | 2.725 | 0.514 | ^ **7** | 1.479 | 0.771 | 1.797 | 0.665 | 2.131 | 0.591 | 2.487 | 0.536 | ^ **8** | 1.435 | 0.782 | 1.718 | 0.680 | 2.010 | 0.608 | 2.316 | 0.555 | ^ **9** | 1.400 | 0.791 | 1.657 | 0.693 | 1.917 | 0.623 | 2.187 | 0.571 | ^ **10** | 1.372 | 0.799 | 1.607 | 0.704 | 1.843 | 0.637 | 2.085 | 0.585 | ^ **11** | 1.349 | 0.806 | 1.567 | 0.714 | 1.783 | 0.649 | 2.003 | 0.598 | ^ **12** | 1.329 | 0.812 | 1.533 | 0.723 | 1.733 | 0.659 | 1.935 | 0.610 | ^ **13** | 1.312 | 0.818 | 1.504 | 0.731 | 1.691 | 0.669 | 1.878 | 0.620 | ^ **14** | 1.297 | 0.823 | 1.478 | 0.738 | 1.654 | 0.677 | 1.829 | 0.630 | ^ **15** | 1.284 | 0.828 | 1.456 | 0.745 | 1.622 | 0.685 | 1.787 | 0.639 | ^ **16** | 1.272 | 0.832 | 1.437 | 0.751 | 1.594 | 0.693 | 1.750 | 0.647 | ^ **17** | 1.262 | 0.836 | 1.419 | 0.757 | 1.569 | 0.700 | 1.717 | 0.654 | ^ **18** | 1.253 | 0.840 | 1.404 | 0.763 | 1.547 | 0.706 | 1.687 | 0.661 | ^ **19** | 1.244 | 0.843 | 1.390 | 0.767 | 1.527 | 0.712 | 1.661 | 0.668 | ^ **20** | 1.237 | 0.846 | 1.377 | 0.772 | 1.509 | 0.717 | 1.637 | 0.674 | ^ **21** | 1.230 | 0.849 | 1.365 | 0.776 | 1.492 | 0.723 | 1.615 | 0.680 | ^ **22** | 1.223 | 0.852 | 1.354 | 0.781 | 1.477 | 0.728 | 1.596 | 0.685 | ^ **23** | 1.217 | 0.855 | 1.344 | 0.784 | 1.463 | 0.732 | 1.578 | 0.691 | ^ **24** | 1.211 | 0.857 | 1.335 | 0.788 | 1.450 | 0.737 | 1.561 | 0.695 | ^ **25** | 1.206 | 0.860 | 1.327 | 0.792 | 1.438 | 0.741 | 1.545 | 0.700 | ^ **26** | 1.201 | 0.862 | 1.319 | 0.795 | 1.427 | 0.745 | 1.531 | 0.705 | ^ **27** | 1.197 | 0.864 | 1.311 | 0.798 | 1.417 | 0.748 | 1.517 | 0.709 | ^ **28** | 1.193 | 0.866 | 1.304 | 0.801 | 1.407 | 0.752 | 1.505 | 0.713 | ^ **29** | 1.189 | 0.868 | 1.298 | 0.804 | 1.398 | 0.755 | 1.493 | 0.717 | ^ **30** | 1.185 | 0.870 | 1.291 | 0.806 | 1.389 | 0.759 | 1.482 | 0.720 | ^ **40** | 1.156 | 0.885 | 1.245 | 0.828 | 1.325 | 0.785 | 1.400 | 0.750 | ^ **50** | 1.137 | 0.896 | 1.214 | 0.844 | 1.283 | 0.804 | 1.347 | 0.772 | ^ **60** | 1.124 | 0.904 | 1.193 | 0.856 | 1.254 | 0.819 | 1.310 | 0.788 | ^ **70** | 1.113 | 0.910 | 1.176 | 0.865 | 1.232 | 0.830 | 1.283 | 0.802 | ^ **80** | 1.105 | 0.915 | 1.163 | 0.873 | 1.214 | 0.840 | 1.261 | 0.813 | ^ **90** | 1.098 | 0.920 | 1.153 | 0.879 | 1.200 | 0.848 | 1.244 | 0.822 | ^ **100** | 1.093 | 0.923 | 1.144 | 0.885 | 1.189 | 0.855 | 1.229 | 0.830 | (주) 상하한을 구하기 위해 [MTBF]에 곱해야 할 계수는 * $$ \left( \frac{2r}{\chi^{2}_{1-\alpha/2} (2r)} , \frac{2r}{\chi^{2}_{\alpha/2} (2r)} \right) $$ 로 하여 산출 ---- * [[MTBF]]