Abstract
GeoPT is a new proficiency test for silicate rock analysis. Participants’ results are processed by the formation of a z-score, according to the Harmonised Protocol on Proficiency Testing. Two classes of performance criteria are available for participants to work to. In the second round conducted in 1997, 44 analytes were given z-scores and 13 reported without z-scores. Of the results to which z-scores were assigned, 74.4% were classified as satisfactory.
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