Competence requirements for organizations that design and run proficiency testing schemes used by laboratories to demonstrate ongoing performance. ISO/IEC Quality & Accreditation
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37 results for “Proficiency testing”
Standards
ISO 13528:2022 — Statistical methods for use in proficiency testing by interlaboratory comparison
The statistical toolbox for proficiency testing: assigned values, performance statistics such as z-scores and En numbers, and homogeneity/stability assessment. ISO/IEC Statistics
Dictionary
Proficiency testing
Evaluation of participant performance against pre-established criteria by means of interlaboratory comparisons — an ISO/IEC 17025 requirement for demonstrating ongoing competence. ISO/IEC…
Dictionary
Z-score
A proficiency-testing statistic z = (x − X)/σ_pt comparing a participant result with the assigned value in units of the standard deviation for…
Proficiency-testing En number from your result and the reference value with their expanded uncertainties — |En| ≤ 1 scoring per ISO 13528 for ISO/IEC…
Dictionary
Normalized error (En)
…U²(x) + U²(X)). |En| ≤ 1 indicates agreement within expanded uncertainties; it is the standard scoring for calibration proficiency tests. ISO 13528:2022 Statistics
Documents
SOP 29 — Assignment of Uncertainty
…Control chart values are obtained over time and usually have more degrees of freedom than results from one or a few proficiency testing results…
Proficiency testing only means something if the scheme itself is competent — the assigned value honest, the items stable and homogeneous, the statistics sound. ISO…
Documents
GLP 1 — QA Lab Measurement Results
…Use of externally obtained data from calibrations, proficiency tests, and interlaboratory comparisons in the assessment of errors and bias in measurement results; and g…
…Often, NIST performs proficiency testing for customers who maintain their own primary standards. For these tests, a transfer standard flow meter is calibrated by…