Statistical methods for use in proficiency testing by interlaboratory comparison

2015 ◽  
Keyword(s):  
Statistical Methods ◽  
Proficiency Testing ◽  
Interlaboratory Comparison

Repeatability and Reproducibility of the Static Elastic Modulus of Concrete Measurement

2018 ◽  
Vol 272 ◽  
pp. 214-219
Author(s):  
Petr Misák ◽  
Tomáš Vymazal ◽  
Dalibor Kocáb ◽  
Barbara Kucharczyková
Keyword(s):  
Elastic Modulus ◽  
Statistical Methods ◽  
Modulus Of Elasticity ◽  
Interlaboratory Comparison ◽  
Hardened Concrete ◽  
Test Results ◽  
Static Modulus ◽  
Repeatability And Reproducibility ◽  
Expected Values ◽  
Static Modulus Of Elasticity

In recent years, the static modulus of elasticity is one of the most discussed property of hardened concrete. The aim of this article is to show results of 6 performed experiments focused on test results precision. The measurements were made according to the standards ISO 6784 and ISO 1920-10. More than 20 participants (laboratories) from Europe took part in these experiments. Test results were compared using the statistical methods for interlaboratory comparison. Repeatability and reproducibility, which provide more detailed information about range of expected values of elastic modulus, are the most discussed characteristics in the article.

scholarly journals Inter-laboratory comparison on the calibration of measurements photometric and radiometric sensors

2019 ◽  
Author(s):  
K. Berk Sönmez ◽  
T. Oytun Kılınç ◽  
İ. Ahmet Yüksel ◽  
Sinem Ön Aktan
Keyword(s):  
Proficiency Testing ◽  
Interlaboratory Comparison ◽  
Technical Committee ◽  
The Other ◽  
Quality Of Results ◽  
Laboratory Performance ◽  
The World ◽  
The Right ◽  
Calibration Laboratories

The competences of the test and calibration laboratories are provided by two complementary methods. The first of these methods is the on-site audit carried out by the administrative and technical committee established by TURKAK (Turkish Accreditation Institution) according to the requirements of TS EN ISO / IEC 17025 [1]. The other technique is interlaboratory comparison and proficiency testing to evaluate laboratory performance and ensure the quality of results. Investing in the right equipment, training personnel, defining methods, documenting, calculating uncertainty, even performing internal verifications do not guarantee reliability or accuracy. It cannot answer the question of whether we can produce the same results as the same testers in the world. It is necessary to prove that the laboratory can actually produce accurate results externally by going through comparison tests with other national/international laboratories.

North American Pretransfusion Testing Practices, 2001–2004: Results From the College of American Pathologists Interlaboratory Comparison Program Survey Data, 2001–2004

2005 ◽  
Vol 129 (8) ◽  
pp. 984-989
Author(s):  
Ira A. Shulman ◽  
Lieta M. Maffei ◽  
Katharine A. Downes
Keyword(s):  
Ionic Strength ◽  
North America ◽  
Proficiency Testing ◽  
North American ◽  
Interlaboratory Comparison ◽  
Clinical Laboratory ◽  
Peer Group ◽  
Antibody Detection ◽  
Testing Practices ◽  
Low Ionic Strength

Abstract Context.—Pretransfusion testing of whole blood and red blood cell recipients is regulated by the federal government under the authority of the Clinical Laboratory Improvement Amendments of 1988. Regulated tests include determination of ABO group, Rh D type, antibody detection, antibody identification, and crossmatching. A wide variety of methods and reagents are available for these regulated tests. During 2001–2004, the College of American Pathologists (CAP) Interlaboratory Comparison Program (Proficiency Testing) J-Survey collected data from more than 4000 laboratories regarding their pretransfusion testing practices. Those data are presented in this report. Objective.—To assess current testing practices for ABO grouping, Rh D typing, antibody detection, and crossmatching in North America. Design.—Data collected for the CAP Interlaboratory Comparison Program (Proficiency Testing) J-Survey were analyzed for trends in laboratory testing practice during 2001– 2004. The data were grouped for analysis by peer group (testing method used) for ABO grouping, Rh D typing, antibody detection, and crossmatching and then analyzed. Setting, Patients, or Other Participants.—Subscribers to the CAP Interlaboratory Comparison Program Transfusion Medicine J-Series. Results.—The most common testing schemes used in North America during 2001–2004 are as follows: ABO grouping (most laboratories perform tube testing: 97.6% in 2000 and 91.1% in 2004); Rh D typing (most laboratories perform tube testing: 97.7% in 2001 and 91.1% in 2004); antibody detection (most laboratories perform tube testing: 69.7% in 2001 and 55% in 2004, most frequently with the low ionic strength solution anti-human globulin [AHG] method, 48.3% in 2001 and 39.9% in 2004; as of 2004 slightly more laboratories use the gel AHG method [42%] than the low ionic strength solution AHG tube method); crossmatching for alloimmunized patients (most laboratories perform tube testing using a low ionic strength solution AHG method; 55.8% in 2001 and 47.6% in 2004); and crossmatching for nonalloimmunized patients (tube testing using an immediate spin method; 42% in 2001 and 40.4% in 2004). Conclusions.—Most North American laboratories currently favor tube methods when performing ABO grouping, Rh typing, antibody screening, and crossmatching. However, there has been a significant increase in the use of gel-based methods in recent years, especially for antibody detection and crossmatching. Data collection and data analysis of CAP Interlaboratory Comparison Program Survey results allow for assessment of laboratory proficiency and provide insights into current North American practice trends in pretransfusion compatibility testing.

The Potential for Failure in Gynecologic Regulatory Proficiency Testing With Current Slide Validation Criteria: Results From the College of American Pathologists Interlaboratory Comparison in Gynecologic Cytology Program

2006 ◽  
Vol 130 (8) ◽  
pp. 1114-1118 ◽  
Author(s):  
Nancy A. Young ◽  
Ann T. Moriarty ◽  
Molly K. Walsh ◽  
Edward Wang ◽  
David C. Wilbur
Keyword(s):  
Proficiency Testing ◽  
Statistical Difference ◽  
Interlaboratory Comparison ◽  
Poor Performance ◽  
Scope Of Practice ◽  
Field Validation ◽  
Squamous Intraepithelial Lesion ◽  
Validation Criteria ◽  
Intraepithelial Lesion ◽  
Consensus Diagnosis

Abstract Context.—Current regulatory proficiency testing scoring results in an automatic failure for identifying high-grade squamous intraepithelial lesion (HSIL) as negative. Objective.—The College of American Pathologists Interlaboratory Comparison Program in Cervicovaginal Cytology data from January 2004 to April 2005 were analyzed to estimate the percentage of failure based on negative responses for HSIL and validation criteria. Design.—More than 15 000 participants received field-validated and educational slide sets for conventional, ThinPrep, and SurePath modules. Educational sets fulfilled the validation criteria of the Center for Medicare and Medicaid Services, which required the consensus diagnosis of biopsy-proven HSIL (not field-validated) after review by 3 pathologists. The College of American Pathologists field validation required at least 20 responses to the HSIL+ series, with 70% matched to HSIL+ (standard error ≤ 0.05). Minimum regulatory proficiency testing failure estimates were based on incorrect negative responses for the reference category of HSIL. Results.—For both cytotechnologists and pathologists, there was a statistically significant higher failure rate for slides that were not field-validated versus those that were field-validated. In conventional modules, 5.3% of the slides that were not field-validated were called negative, versus 1.2% of the field-validated slides. In all liquid-based preparations, 4.0% of the non–field-validated versus 2.2% field-validated slides were called negative. Pathologists would have failed more often than cytotechnologists for the slides that were not field-validated, whereas there was no statistical difference in failure performance with field-validated slides. Conclusions.—Failures were significantly greater with the slides that were not field-validated for both conventional and liquid-based preparations (ThinPrep only) and have implications for both regulatory proficiency testing and expert legal review. Poor performance of pathologists relative to that of cytotechnologists may reflect a lack of prescreening of slides or scope of practice issues.

Robustness of Validation Criteria in the College of American Pathologists Interlaboratory Comparison Program in Cervicovaginal Cytology

2006 ◽  
Vol 130 (8) ◽  
pp. 1119-1122 ◽  
Author(s):  
Andrew A. Renshaw ◽  
Molly K. Walsh ◽  
Barbara Blond ◽  
Ann T. Moriarty ◽  
Dina R. Mody ◽  
...  
Keyword(s):  
Proficiency Testing ◽  
Interlaboratory Comparison ◽  
Low Grade ◽  
Proficiency Tests ◽  
Field Validation ◽  
Squamous Intraepithelial Lesion ◽  
Not Otherwise Specified ◽  
Validation Criteria ◽  
Intraepithelial Lesion ◽  
Different Levels

Abstract Context.—Field validation of slides used in gynecologic cytology proficiency testing has surfaced as an important issue. Although the precision of diagnoses in peer-reviewed educational programs has been examined, the robustness of the validation criteria for specific types of interpretations used in proficiency testing has not been previously studied. Objective.—To evaluate the robustness of validation criteria for slides entering an educational slide program. Design.—We reviewed the results of the College of American Pathologists Interlaboratory Comparison Program in Cervicovaginal Cytology and compared the robustness of validation criteria for different reference diagnoses, using a total of 16 948 circulating slides. Results.—Validation criteria could be divided into 2 significantly different groups. The criteria for herpes, Trichomonas, squamous cell carcinoma, and adenocarcinoma were significantly more robust than the diagnoses of unsatisfactory; negative for intraepithelial lesion and malignancy, not otherwise specified; low-grade squamous intraepithelial lesion; and high-grade squamous intraepithelial lesion (P < .001). Conclusions.—The validation criteria used in the College of American Pathologists Interlaboratory Comparison Program in Cervicovaginal Cytology show 2 different levels of robustness or redundancy. These results have implications for the design of fair proficiency tests. Proficiency testing can be designed with the necessary number of reviews needed for slide validation.

Proficiency Testing in Chemical Analysis of Iron Ore: Comparison of Statistical Methods for Outlier Rejection

MAPAN ◽  
2013 ◽  
Vol 29 (2) ◽  
pp. 87-95 ◽  
Author(s):  
Sanchita Chakravarty ◽  
Ashok Mohanty ◽  
Barun Ghosh ◽  
Mita Tarafdar ◽  
Shankar G. Aggarwal ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Statistical Methods ◽  
Proficiency Testing ◽  
Iron Ore ◽  
Outlier Rejection
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