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Register a new userEvaluating the competence of test laboratories by Participating in Inter-comparison Tests and Statistical Analysis of Test Results
تقييم كفاءة مخابر الاختبار من خلال المشاركة في اختبارات المقارنة البينية و التحليل الإحصائي لنتائج الاختبار
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هدف هذا البحث إلى إظهار أهمية المشاركة في اختبارات المقارنة البينية، التي تعد من الوسائل المهمة المستخدمة في ضبط جودة نتائج الاختبار و تقييم مستوى أداء المخبر، كما أنها تساعد الزبون و السلطات التشريعية على انتقاء المخبر الكفء. وصف هذا البحث كيفية استخدام برامج المقارنات البينية و تنظيمها، و كيفية التحليل الإحصائي لنتائج الاختبارات. و تضمن دراسة عملية لتقييم أداء مخابر المنشآت الصناعية النسيجية السورية العامة عن طريق توزيع عينات على المخابر المشاركة في البرنامج في الوقت نفسه من أجل تحليلها، و من ثم جمعت نتائج الاختبارات و عولِجت بطريقة علمية تمكن الباحثين من تحديد نقاط الضعف في أداء المخابر، و من ثَم زودت بتغذية راجعة و نصائح تقنية تساعد على تحديد مشكلات القياس و تقييم الطريقة و الجهاز المستخدم، كما قَدم توصيات و مقترحات من شأنها إذا ما تم العمل بموجبها أن تساعد على تجاوز نقاط الضعف الموجودة في مخابرنا.
Participation in inter-laboratory comparison programs is an important means of laboratory quality control and assessing laboratory performance, and these programs can be used by customers or regulatory bodies for the selection of qualified laboratories. This research describes how to use inter-comparison tests and how to statistically analyse the test results. This research has a practical study of assessing laboratories performance in laboratories of the Syrian textile firms by distributing samples simultaneously to participating laboratories for testing. After collecting test results, the researcher used scientific methods to handle data to identify the weak points in laboratories performance and provide them the Feedback and technical advice to Assistance the lab to defining the measurement problems and evaluating of test methods and instrumentation , and could introduce some suggestions and recommendations to overcome.
References used
Revoil Gilles; ISO17025: Quality Management, Requirements, Fundamentals- Project by European Union,2010
ISO 5725-1,1994- Accuracy (trueness and precision) of measurement methods and results — Part 1 General principles and definitions.1st.ed, ISO,17P
ISO 5725-2,1994, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method. 1st.ed, ISO,42P
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This research aims to present the importance of using statistical methods while establishing a quality
management system in the laboratory according to the requirements of the international standard ISO
17025:2005.
In addition the research describ
es how statistical analysis of the tests results works and includes a
practical study to evaluate the technical competence of the laboratory by using the most common
statistical methods (hypothesis testing) to study the results in a scientific way enables researchers to
identify weaknesses in the laboratory performance, and thus provides it with feedback and technical
advice helping to determine measurement problems and to check the Trueness of tests results.
Finally, the research provides recommendations and proposals such as a necessity of applying practical
methods for monitoring the performance of tests , making sure they meet quality requirements in terms of
trueness and precision , and working to remove the causes that affect the quality of performance during
all phases of testing, these proposals would – if they have been applied – support the laboratory to obtain
the certification in accordance with international standard ISO 17025:2005.
The research aims to estimate the effect of sample size on the statistical test
power (t) for one sample, two interrelated samples, two independent samples,
and on the statistical test power of one-way analysis of variance test (F) to
compare the
averages. The descriptive method was used, and different sizes
of samples (300) items, where it was generated using the program (PASS 14),
and taken into account to be realized in this data the set of assumptions
needed to make test (t) and (F), with respect to random testing, categorical
level of measurement, normal distribution, and equinoctial variance.
This research aims to show the importance of ensuring the
competence of all who operate specific equipment, perform tests
and/or calibrations, evaluate results, and sign test reports and
calibration certificates.
Testing in the Syrian educational system has been growing in the past six years with the average number of tests that schools and colleges set every year increased three-folds. This test inflation paved the way to the birth of a ‘testocracy’ that bro
ught about new challenges for stakeholders and test developers. Of all the tests that Syrian students take, the National Baccalaureate Examination (NBE from here onwards) is the most critical. In the present research we try to shed light on one part of this test, namely the NBE of English language. Within the broad lines of language testing, we aimed to investigate the possibility of predicting certain facets of test impact via close examination of the test template in isolation from other factors in the teaching/learning environment.
This paper presents a study on the application of vibration signals to detect
the presence of defects in gears. Several gear failure prediction methods
were investigated and applied to experimental data from a test gear
apparatus. The primary obje
ctive was to provide a baseline understanding
of the prediction methods and to evaluate their diagnostic capabilities. The
methods investigated use the signal average in both the time and frequency
domain to detect gear failure.
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