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At the end of each exercise, laboratory specific report in PDF format is issued. This report provides detailed analysis of performance of all reported analytes for particular exercise.
Evaluation of result is based on the comparison between the result reported by the participant and assigned value calculated based on result submitted by homogenous participants. The result is presented in statistical as well as in graphical presentation.
The assigned value coincides with the average of the result submitted by the participant (Average of the homogenous group). The mean and standard deviation of the homogeneous group are calculated using Algorithm A described in Annex C of ISO 13528:2015 standard.
Standard uncertainty of assigned value is determined as per below given formula.
U (xpt) = 1.25 x σ/√p
Laboratory performance is evaluated as a Z-score and calculated as per below formula given in ISO 13528:2015 standard:
Z = (Xi-Xpt) / σpt
Evaluation of performance is based on the comparison between the result reported by the participant and assigned value (robust mean) is calculated based on result submitted by homogenous participants. The statistical evaluation is presented in tabulated form as well as in graphical presentation.
Assigned value (robust mean) and standard deviation of the homogeneous group are calculated using Algorithm A described in Annex C of ISO 13528 standard. As consensus value from participant results is used to establish assigned value (robust mean) hence metrological traceability of results is not appropriate.
Standard uncertainty of assigned value is determined as per below given formula.
U (xpt) = 1.25 x σ/√p
Participant performance is evaluated as a Z score and calculated as per below formula given in ISO 13528 standard:
Z = (Xi-Xpt) / σpt
Criteria | Description |
---|---|
|Z| ≤ 2.0 | If your Z score lies between ±2.0 Z score - considered to be Acceptable |
2.0 < |Z| < 3.0 | If your Z score lies between ± 2.0 to 2.99 - considered to be Questionable (warning signal) |
|Z| ≥ 3.0 | If your Z score is ± 3.0 Z score or more then it - considered to be Unacceptable (action signal). |
Evaluation of performance is based on the comparison between the result reported by the participant and assigned value (robust mean) is calculated based on result submitted by homogenous participants. The statistical evaluation is presented in tabulated form as well as in graphical presentation.
Assigned value (robust mean) and standard deviation of the homogeneous group are calculated using Algorithm A described in Annex C of ISO 13528 standard. As consensus value from participant results is used to establish assigned value (robust mean) hence metrological traceability of results is not appropriate.
Standard uncertainty of assigned value is determined as per below given formula.
U (xpt) = 1.25 x σ/√p
Participant performance is evaluated as a z or z’ score and calculated as per below formula given in ISO 13528 standard:
z score = (Xi-Xpt) / σpt
z’ score = (Xi-Xpt) / SQRT [(σpt)2 + [U2(xpt)]
Criteria | Description |
---|---|
z/z’score ≤ 2.0 | If your z/z’ score lies between ±2.0 z/z’ score - considered to be Acceptable |
2.0 < z/z’score < 3.0 | If your z/z’ score lies between ± 2.0 to 2.99 - considered to be Questionable (warning signal) |
z/z’score≥3.0 | If your z/z’ score is ± 3.0 z/z’ score or more then it - considered to be Unacceptable (action signal). |