* * * * * Please Note Unusual Time and Place * * * * * *
 
 
Statistics Seminar
 
Statistical Laboratory
Iowa State University
 
DATE AND TIME:  Thursday, March 23, 2006, 8:00 a.m.
 
PLACE:  1160 Sweeney
 
SPEAKER:  Yurong Wang and William Meeker, Department of Statistics, Iowa State University
                                   
TITLE:  Assessment of Nondestructive Evaluation (NDE) Probability of Detection for Inspection with a Bivariate Response
 
ABSTRACT
 
Nondestructive evaluation (NDE) methods are used widely in modern industry to assure the integrity of critical system components. Examples include rotating components of jet engines and heat-transfer tubes in nuclear power plants. There is an important need to quantify the probability of detection (POD) for NDE applications in both production quality control and in-service inspection for expensive components that degrade over time. The standard method of estimating POD, known as aˆversus a, uses a linear regression relating NDE signal response to aw or defect size. This paper extends this standard one-dimensional POD estimation method for bivariate responses. The extended methods allow for truncation and censoring encountered in many NDE applications. Atypical aw misses in one of our NDE application examples could not be directly accounted for by the the extended ˆa versus a method. Extra modeling e orts were made to accommodate those aw misses.
 
Key Words: Atypical aw misses, Censoring, Nondestructive Evaluation (NDE), Probability of Detection (POD), Truncation
Seminar schedules and abstracts are available via WWW:  http://www.stat.iastate.edu/

Jeanette La Grange
Department of Statistics
102 Snedecor
Iowa State University
Ames, IA  50010-1210
515 294-3440 (office)
515 294-4040 (fax)
http://www.stat.iastate.edu/directory/staff/jeanette.html