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An Alternative Method Validation Strategy for the European Decision 2002/657/EC
No full text<p>Validation; 2002/657/EC; Detection capability; Precision; SUMMARY The European decision 2002/657/EC imposes that each analytical method used for official control of foodstuffs is validated. The methodologies described in the ISO 5725 and the ISO 11843 standards are used to set up an experimental validation plan that minimizes the number of samples without increasing the uncertainty of the performance characteristics. At each level (0.5, 1 and 1.5 times the MRL) minimum 8 samples are analyzed on 3 different days. Recovery, repeatability, within-lab reproducibility, CCalfa and CCbeta are determined simultaneously. The uncertainty of each performance characteristic is not increased since the degrees of freedom are equal or higher compared to the conventional validation plan. Only 24 samples (27 samples for a balanced design) are needed with this validation strategy. INTRODUCTION Validation of the analytical method is required for every method used for the official control of foodstuffs. The validation procedure and the performance characteristics for these methods are defined in the European Decision 2002/657/EC. (1) A performance characteristic is a quality measure of the analytical method. The performance characteristics specificity, accuracy, trueness, precision, repeatability, reproducibility, recovery, detection capability and ruggedness are required by the latter decision. To obtain these characteristics a lot of analytical work has to be performed in the laboratory. It is generally known that validation of analytical methods is a time and money consuming activity. The validation effort can easily be reduced by introducing a smaller number of samples. However this will enlarge the uncertainty associated with the performance characteristic. The increase in uncertainty of the performance characteristics can be avoided by combining the validation experiments. The aim of this paper is to develop a validation plan for a quantitative confirmatory method. A maximum of performance characteristics should be obtained with a minimum of samples without an increase of the uncertainty. EXPERIMENTAL</p>
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El Tlacuache Núm. 657 (2015). 657 Año 13 (2015) enero. El Tlacuache
No full text¿Problemas de identidad? Cambio cultural, xenofobia y trampas esencialistas por Israel Lazcarro Salgao. - Rituales funerarios y culto a los difuntos entre totonacas poblanos y tepehuas serranos por Karina Munguía Ocho
Verlustliste Nr. 657. (Nr. 657. /1918)
No full textVERLUSTLISTE NR. 657.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Gibson, G I, 657
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/387347Surname: GIBSON. Given Name(s) or Initials: G I. Military Service Number or Last Known Location: 657. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 13111.209287
Item: [2016.0049.19640] "Gibson, G I, 657
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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