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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2005“What accuracy do you need?” This is a sensible question, which needs to be asked, yet how often do we receive a sensible answer? The naïve customer might say “the best possible accuracy”, which is not very sensible because it implies an enormou[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2005EDXRF offers significant advantages for multi-element applications in the analysis of a wide range of inorganic materials for R&D, production and quality control/trouble shooting applications, despite the better detection limit levels achieved b[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2002It is fairly well known that a basic assumption of regression is that the y-values (the dependent- or response variable) are random variables while the x-values (the independent- or predictor variable) should be error-free. This model often prev[...]
documento electrónico
ISABEL C.F.R. FERREIRA, Autor ; AMILCAR L. ANTONIO, Autor ; SANDRA CABO VERDE, Autor | Cambridge [REINO UNIDO] : Royal Society of Chemistry | 2018This comprehensive book is a useful reference for food technologists, analytical chemists and food processing professionals, covering all aspects of gamma, electron beam and X-ray food irradiation, its impact on food matrices and microorganisms,[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2003Many analytical chemists find the logic of hypothesis tests and confidence intervals hard to follow. What looks like a probability statement about a true concentration is in fact an assertion about random intervals, involving data we did not obs[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2004In some proficiency tests concerned with measuring the proportion of genetically modified organism (GMO) in food the results produced are logtransformed (converted into logarithms) before zscores are calculated [1]. The transformation can be jus[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2005Examining a calibration function for linearity is an everyday task in both validating analytical methods and routine analytical operations. Linearity is an important and desirable feature of an analytical method. For example, if a calibration fu[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2003Analysts’ estimates of the uncertainty of their results are often somewhat low. How do we know? By looking at the results of interlaboratory studies such as collaborative trials and proficiency tests. These studies are designed to make explicit [...]
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J. IGNACIO GARCIA ALONSO, Autor ; PABLO RODRÍGUEZ GONZÁLEZ, Autor | Cambridge [REINO UNIDO] : Royal Society of Chemistry | 2013Isotope Dilution Mass Spectrometry (IDMS) has become an essential tool in research laboratories and is increasingly used in routine analysis labs (including environmental, food safety and clinical applications). This is the first textbook to pre[...]
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ROYAL SOCIETY OF CHEMISTRY | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2001Organoleptically, nutritionally and economically, the protein content of food is of paramount importance. The quantitative assessment of protein content, based on the determination of nitrogen concentration on a fat-free basis, permits the detec[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2004While a single z-score provides a valuable indication of the performance of a laboratory, a set or sequence of z-scores provides a deeper insight. Moreover, z-scores collected over time for a single analyte/test material combination provide info[...]
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2006Histograms are the usual vehicle for representing medium sized data distributions graphically, but they suffer from several defects. The kernel density estimate is an alternative computer-intensive method, which involves smoothing the data while[...]
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ROYAL SOCIETY OF CHEMISTRY | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2001Robust statistics is a convenient modern way of summarising results when we suspect that they include a small proportion of outliers. Most estimates of central tendency (e.g., the arithmetic mean) and dispersion (e.g., standard deviation) depend[...]
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THOMAS PROHASKA, Editor científico ; JOHANNA IRRGEHER, Editor científico ; ANDREAS ZITEK, Editor científico ; NORBERT JAKUBOWSKI, Editor científico | Cambridge [REINO UNIDO] : Royal Society of Chemistry | News Developments in Mass Spectrometry | 2015This book was triggered by the success story of sector field mass spectrometry in elemental and isotopic analysis since the first presentation of the mass spectrum of Ne a hundred years ago. The outstanding and unique features of sector field ma[...]
