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Título:
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Proficiency testing : assessing z-scores in the longer term
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Autores:
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THOMPSON, MICHAEL
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Tipo de documento:
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texto impreso
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Editorial:
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Cambridge [REINO UNIDO] : Royal Society of Chemistry, 2004
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Colección:
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AMC Technical Brief, num. 16
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ISBN/ISSN/DL:
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29722
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Dimensiones:
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2 p.
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Nota general:
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ISBN:
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Langues:
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Inglés
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Clasificación:
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ESTADÍSTICAS (DATOS)
MÉTODOS ANALÍTICOS
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Resumen:
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While 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 information on the participant’s uncertainty. Both graphical and numerical methods may be appropriate for assessing a sequence of z-scores. However, due caution is required with numerical methods to avoid incorrect conclusions. The use of a summary score derived from z-scores relating to a number of different analytes is not recommended: it has a very limited range of valid applications and tends to conceal sporadic or persistent problems with individual analytes. Moreover it is prone to misuse by non-scientists.
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