검출율 및 PPM 계산
Detection Rate and PPM Calculation
1. 용어 정의
1. Definition of Terms
- 총 결함 수 = TP + FN
Total Defects = TP + FN - 검출 PPM = (TP / (TP + FN)) × 1,000,000
Detection PPM = (TP / (TP + FN)) × 1,000,000 - 미검출 PPM = (FN / (TP + FN)) × 1,000,000
Non-detection PPM = (FN / (TP + FN)) × 1,000,000
2. 예시
2. Example
검사 제품 수: 100,000개
Total inspected units: 100,000
실제 결함 수: 500개
Actual defectives: 500
검출 성공: 495개 (TP)
Correct detections: 495 (TP)
검출 실패: 5개 (FN)
Missed detections: 5 (FN)
3. 계산 결과
3. Calculation Results
검출율 = 495 / (495 + 5) = 0.99 = 99%
Detection Rate = 495 / (495 + 5) = 0.99 = 99%
Detection Rate = 495 / (495 + 5) = 0.99 = 99%
검출 PPM = (495 / 500) × 1,000,000 = 990,000 PPM
Detection PPM = (495 / 500) × 1,000,000 = 990,000 PPM
Detection PPM = (495 / 500) × 1,000,000 = 990,000 PPM
미검출 PPM = (5 / 500) × 1,000,000 = 10,000 PPM
Non-detection PPM = (5 / 500) × 1,000,000 = 10,000 PPM
Non-detection PPM = (5 / 500) × 1,000,000 = 10,000 PPM
4. 요약표
4. Summary Table
| 지표 Metric |
수식 Formula |
결과 Result |
|---|---|---|
| 검출율 Detection Rate |
TP / (TP + FN) | 99% |
| 검출 PPM Detection PPM |
(TP / (TP + FN)) × 1,000,000 | 990,000 |
| 미검출 PPM Non-detection PPM |
(FN / (TP + FN)) × 1,000,000 | 10,000 |
5. 활용
5. Application
- 제조 품질 수준 평가
Used to evaluate manufacturing quality - 고객 품질 요구 충족 여부 확인
Check compliance with customer quality requirements - 장비 성능 비교
Compare equipment performance