FDR Fault Detection Ratio j number of inspectors

קנטרוביץ. אמד שפותח ע"י א FDR – Fault Detection Ratio מדד איכות הסריקה j – number of inspectors FDR(j) - estimator of FDR with j inspectors Jreqired is the smallest j satisfying FDR(j)≥FDRrequired Costs=j*duration of inspection * hourly wage FDR(j) – TQM type costs of quality function לפני הסריקה נתן לאמוד את מספר הסורקים הנדרש . Costs ואת מחיר הסריקה Jreqired Copyright © 2009 by Eliezer Kantorowitz 7

Assuming Linear Distribution of the Probability Pi, 1 that One Inspector Detects fault i

Fault Detection Ratio FDR(j) The probability that j inspectors detects fault i is estimated as The expected ratio of all faults that j inspectors will detect is denoted FDR(j) and is estimated as Copyright © 2009 by Eliezer Kantorowitz 10

Kantorowitz Estimator After some mathematical manipulation we obtain the Kantorowitz estimator : The metrics of the estimator FDRmax – the ratio of all faults that the inspectors are able to detect P 0, 1 – The probability that 1 inspector detects the easiestto-detect fault Copyright © 2009 by Eliezer Kantorowitz 11