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 GE Inspection TechnologiesInspection Technologies, a business of the Baker Hughes, a GE company (BHGE IT), is one of the world's leading suppliers of nondestructive testin ...
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Technical Discussions
Jaeseo Park
R & D,
DOOSAN, South Korea, Joined Jun 2009, 10

Jaeseo Park

R & D,
DOOSAN,
South Korea,
Joined Jun 2009
10
04:07 Dec-15-2018
Probability of detection

Dear professionals,
What does upper right point (POD=1 & PFA=1) in ROC curve mean?
By definition, POD +PFA must be unity.

http://zfp.cbm.bgu.tum.de/mediawiki/index.php/Probability_of_detection_(POD)

Thank you

From Far-East

Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 744

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
744
00:25 Dec-16-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

Your statement that POD + POFA must be unity is incorrect. They are independent

Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 744

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
744
03:33 Dec-16-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

Example
There are 20 samples with flaws in 10.
An inspection calls flaws in all 20.
Then POD is 10/10= 1.0
POFA = 10/10 = 1.0

Reliability = POD (1-POFA) = 0

Jaeseok Park
R & D,
DOOSAN, South Korea, Joined Jun 2009, 10

Jaeseok Park

R & D,
DOOSAN,
South Korea,
Joined Jun 2009
10
12:57 Dec-16-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

To Anmol Birring,
Yes your right. I totally mis-understood the document.
Thank you.

Petronext International
Petronext International
08:06 Dec-18-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

A quantitative result can be calculated by the probability of detection (POD) and the possibility of false alarms (PFA).

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