Abstract
The aim of this work was to evaluate variations in the classification of laboratory performance due to different protocols for use in Proficiency Testing Programs. Here, alternative protocolsthat consider the application of robust statistics to the current one applied by the ASTM were compared. In ASTM protocol, it is necessary to have an exhaustive treating of the data, including the treatment of outliers and the investigation of the existence of Gaussian distribution. The results of the ASTM protocol comparison with the proposed protocols in the matrix data of lubricant oils reported to the ASTM provider showed a difference between the position measures (mean or median) and dispersion measures (variance or range) of the scores produced by the different protocols, causing variation in the classification of laboratory performance. Scaled Median Absolute Deviation (MADe) protocol still showed reduction in the measurement uncertainty associated to the assigned value by consensus.
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