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In order for the results of an experiment to be able to detect with a high probability see annex Cl a prede- termined magnitude of bias, ixo minimum number of laboratories, p, and test results, n, shall satisfy the following equation: It may appear that some laboratories did not use the required equipment or did not work ac- cording to the specified conditions.
A guide to decid- ing how many is given below.
The test results for each level are shown in figures B. Click to learn more. Bias can arise, for example, in chemical analysis if the measurement method fails to extract all of an element, or if the presence of one element interferes with the determination of another.
The repeatability and the reproducibility standard de- viations were then computed excluding those data that were discarded. Metrology and measurement in general Including measuring instruments in general, preferred numbers, standard measures, general aspects of reference materials, etc. Your basket is empty. If so, what are the improvements required? If the repeatability standard deviation of the standard measurement method has not been previously deter- mined in accordance with IS0s, will be con- sidered to be the best estimate of it.
I understand that I cannot print or share electronic products. The laboratory bias is further considered in IS0 This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.
In the former case, the repeatability standard devi- ation, cr, will be used for the assessment of the bias of the measurement method. Do the results of the accuracy experiment justify the acceptability of the measurement method for adoption as a standard? C Derivation of equations Accept and continue Learn more about the cookies we use and how to change your settings.
Reference materials could be either a certified reference materials; b materials manufactured for the purpose of the experiment with known properties; or c materials whose properties have been established by measurements using an alternative measure- ment method whose bias is known to be negligi- ble. Outliers and stragglers Level Lab. IS0 l should be read in conjunction with all other parts of IS0including this part, because it gives the underlying definitions and general principles.
Company organization, management and quality. Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous. If the measurement process is non-destructive, it is poss- ible to give all the laboratories in the interlaboratory experiment the same unit of reference material, but this will extend the time-frame of the experiment.
GSO ISO – Standards Store – GCC Standardization Organization
Accuracy trueness and precision of measurement methods and results – Part 1: IAccuracy trueness and precision of measurement methods and results – Part 1: Take the smart route to manage medical device compliance. Annex B provides practical examples of estimating the precision of measurement methods by experiment. In the latter case, consideration should be given to repeating the experiment with verification at all steps that the standard measurement method is properly implemented. Intermediate measures of the precision of a standard measurement method.
If u, is un- known, its estimate s. All standards are subject to revision, and parties to agreements based on this part of IS0 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated 7525-2.
BS ISO 5725-2:1994
In this report the following information shall be given: Apart from the restriction to a single laboratory. Further regular testing is required to show that the labora- tory bias does not vary; the method described in IS0 may be used for this.
A Awar G 1, Unless otherwise stated, a is assumed to be 0, If the reproducibility of the measurement method is poor, then it will not be practical to achieve a high degree of certainty in the estimate of the bias.
Intermediate measures of the precision of a standard measurement method – Part 4: You can buy this standard from any national standardization body. Unless otherwise stated, a is assumed to be 0. The work of preparing International Standards is normally carried out through IS0 technical committees. As a result the experiment may have to be repeated to yield the expected preci- sion values. In some cases it will be important to include, in the assessment exper- iment, a series of reference materials, each corre- sponding to a different level of the property, as the bias of the standard measurement method may be different at different levels.
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