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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2001Standard errors and confidence intervals for a simple statistic like the mean can be calculated by the use of an algebraic formula derived from familiar assumptions about the data, such as the normal distribution. For a more complex type of stat[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2003Internal quality control (IQC), based on the interpretation of results from the analysis of one or more control materials in every analytical run, is an essential part of routine analysis. The interpretation of the results is usually based on t[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2005The 2006 revision of the Harmonised Protocol [1] encourages providers of proficiency testing schemes to base their scoring method on fitness for purpose. The resulting z-score relates the deviation of the participant’s score from the assigned va[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2002Proficiency testing (PT) is so effective in detecting unexpected problems in analytical work that participation in a scheme (where one is available) is regarded as a prerequisite to accreditation. Moreover, as well as evidence that a laboratory [...]
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ROYAL SOCIETY OF CHEMISTRY | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2001What we should do when results of analytical measurements fall below the detection limit has long been a source of puzzlement. In fact the idea of a detection limit itself is puzzling: why else should we spend so much effort trying to define it [...]
