A comparative study of statistical methods used in analyzing the proficiency testing results of yield stress

Hegazy, R.; Mohamed, M. I.; Abu-Sinna, A.

doi:10.1007/s12647-010-0013-y

Cited by 3 publications

(3 citation statements)

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“…Asia Pacific Metrology Programme organized the proficiency testing (PT) programme on pesticide residues in tea as a joint initiative of the Technical Committee for Amount of Substance (TCQM) and the Developing Economies Committee. PT is defined as one of powerful tool to help laboratory to demonstrate such competence to an accreditation body or other third party and also enables laboratory to monitor their test over time [22]. The Division of Analytical Chemistry and Standard laboratory participated on the PT programme as one of 42 laboratories participant.…”

Section: Analytical Methods Validationmentioning

confidence: 99%

“…The purpose of providing a normalized performance evaluation is to make all PT results comparable [23]. Laboratory performance was assessed by comparing reported test result to the assigned value using both Z-scores that is widely used in the evaluation of laboratory biased and En-Scores, [19][20][22][23][24][25]. A Z-score is the ratio of the bias estimate and the target value for the standard deviation of the result [25].…”

Section: Analytical Methods Validationmentioning

confidence: 99%

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Analytical Method Development for the Determination of Α-Endosulfan and Bifenthrin Pesticide Residues in Tea

Styarini¹,

Andreas²,

Ridwan³

et al. 2014

Indones. J. Chem.

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Section: Analytical Methods Validationmentioning

confidence: 99%

Section: Analytical Methods Validationmentioning

confidence: 99%

Analytical Method Development for the Determination of Α-Endosulfan and Bifenthrin Pesticide Residues in Tea

Styarini¹,

Andreas²,

Ridwan³

et al. 2014

Indones. J. Chem.

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“…5. As the basis determination takes the middle value of the sorted results, the influence of outlier results is minimal; in some cases, it could be avoided (Hegazy, Mohamed and Abu-Sinna, 2010). Interestingly, although the gap of the median from participant 1 to the other four participants has the same value with the gap due to the average value, the different performance criteria are resulted by participant 1.…”

Section: According Tomentioning

confidence: 99%

An Evaluation of Heat Input and Efficiency Test Method Based on Sni 7368:2011 – Single Burner LPG Gas Stove With Igniter System

Utomo

Kusnandar

Ramadhani³

et al. 2019

j. standard.

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Heat input and efficiency test are one of the essential aspects that should be assessed in order to m e a s u re th e energy performance of LPG gas stove. In order to do this, the method e mployed to assess these performance aspects should meet the requirement of the energy test procedure. This paper presents the evaluation o f e n e rg y performance test method of SNI 7368:2011a standard for single gas stove LPG in order to meet energy test procedure criteria. The method of evaluation is conducted through interpersonal comparative test according to BS EN ISO/IEC 17043:2010 -Conformity assessment -General requirements for proficiency testing. Two parameters of z-score and z-robust are used as criteria for the assessment of method evaluation. The result shows that both z-score and z-robust give the same result at satisfactory performance for heat input aspect, while the different performance criteria emerge in the efficiency aspect. The z-score of efficiency aspect gives satisfactory performance, whereas a questionable performance is yielded by z-robust. The further analysis of zrobust brings to the concern about inconsistency relation result between temperature rise, consumption of gas and the test duration. The lack of a method for ensuring the composition of gas during the test in the SNI is identified as a factor that may lead to such an inconsistent result. AbstrakPengajuan asupan panas dan efisiensi adalah salah satu aspek penting yang harus dinilai untuk mengukur kinerja energi kompor gas LPG. Untuk melakukan ini, metode yang digunakan untuk men il a i a sp e k k i ne rj a i n i harus memenuhi persyaratan prosedur uji energi. Makalah ini menyajikan evaluasi metode uji kinerja energi SN I 7368: 2011 -standar untuk LPG kompor gas tunggal untuk memenuhi kriteria prosedur uji energi. Metode evaluasi dilakukan melalui uji komparatif interpersonal menurut BS EN ISO / IEC 1 7043: 2010 -Penilaian kesesuaian -Persyaratan umum untuk pengujian kecakapan. Dua parameter z -score dan z-rob ust digunakan seb agai kriteria untuk penilaian evaluasi metode. Hasil menunjukkan b ahwa b aik z -score dan z-rob ust memberikan hasil yang sama pada kinerja yang memuaskan untuk aspek input panas, sedangkan k i n erj a ya n g b erb eda dihasilkan dari aspek efisiensi. Z-score dari aspek efisiensi memb erikan kinerja yang memuaskan, sedangkan kinerja yang dipertanyakan dihasilkan oleh z -robust. Analisis lebih lanjut dari z-rob ust me mu ncu l kan perhatian tentang hub ungan yang tidak konsisten dari hasil antara kenaikan suhu, konsumsi gas, dan durasi pengujian. Kurangnya metode untuk memastikan komposisi gas selama pengujian dalam SNI diidentifikasi seb agai faktor yang dapat menyebabkan hasil yang tidak konsisten terseb ut.Kata kunci: asupan panas, efisiensi, kinerja, pengujian energi, kompor gas satu tungku 1.

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Traceable Value for Proficiency Test of Natural Gas

Ridwan

Supriadi

Nugraha

2019

Indonesian J. Sci. Technol

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The use of consensus values as the assign value for proficiency testing (PT) activities are currently a common practice in Indonesia, including the field of natural gas analysis. Hence, mostly the performance evaluation is based on consensus agreement. In this work, a PT was conducted using traceable values with respect to ISO/IEC 17043 and ISO 13528. It was demonstrated that the chosen PT scheme has good capability to evaluate the performance of participating laboratories. And, in some cases, the selected PT scheme was not affected by extreme values and limited number of participants. Post analysis to the PT round has been conducted using the information of uncertainty of the traceable value and the uncertainty of robust average of participants’ results. It was demonstrated that there were no significance biases in the PT round. Moreover, it could be concluded that the participating laboratories have a good agreement with one to another. They also have a good agreement with traceable values, giving more additional confidence to the measurement quality in this field of analysis.

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A comparative study of statistical methods used in analyzing the proficiency testing results of yield stress

Cited by 3 publications

References 1 publication

Analytical Method Development for the Determination of Α-Endosulfan and Bifenthrin Pesticide Residues in Tea

Analytical Method Development for the Determination of Α-Endosulfan and Bifenthrin Pesticide Residues in Tea

An Evaluation of Heat Input and Efficiency Test Method Based on Sni 7368:2011 – Single Burner LPG Gas Stove With Igniter System

Traceable Value for Proficiency Test of Natural Gas

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