Aplicação de estatística robusta em ensaios de proficiência

Aplicação de estatística robusta em ensaios de proficiência

Vinicius Biasoli, Rodrigo Doellinger, Kátia Costa, Ivana Pereima e Carla Albuquerque

O propósito do ensaio de proficiência é determinar o desempenho de um laboratório na realização de um ensaio, por meio de comparação Inter laboratorial, que é fundamentada em medidas de referência, de tendência central e de dispersão, usualmente estimadas a partir dos dados dos participantes. Os métodos estatísticos para o cálculo destas medidas são baseados na estatística clássica (ou paramétrica) e na estatística robusta.

A estatística clássica estima a tendência central e a dispersão pela média aritmética e pelo desvio padrão, o que requer uma distribuição normal dos dados.

A estatística robusta é uma abordagem mais recente, na qual as estimativas mais simples são a mediana e o desvio absoluto mediano. Trata-se de uma metodologia mais precisa para produzir estimativas das medidas de referência na presença de outliers.

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Accreditation Cgcre/Inmetro - Certified Reference Material Producer

Controllab has been accredited as a Certified Reference Material Producer (MRC) since 2016 by Inmetro’s General Coordination for Accreditation (CGCRE), under the PMR 0009 number. The assessment of this conformity is carried out according to the requirements established in ABNT NBR standards ISO 17034 and Inmetro, thus ensuring competence for the production of MRCs, according to the Scope of Accreditation.

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Accreditation Cgcre/Inmetro - Calibration Laboratory

In December 2002, the Calibration Laboratory was accredited by Inmetro’s General Coordination for Accreditation (CGCRE). With this recognition, it became an integral part of the Brazilian network of accredited laboratories, under nº214. Since then, it is periodically evaluated for the maintenance and/or extension of accreditation.

Cgcre is signatory to the Mutual Recognition Arrangements of the International Laboratory Accreditation Cooperation (ILAC) and Interamerican Accreditation Cooperation (IAAC).

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Accreditation Cgcre/Inmetro - Control Laboratory

In September 2011, Controllab was accredited by Inmetro’s General Coordination for Accreditation (CGCRE) as a proficiency test provider, under nº PEP0003. Initially as part of a pilot project by Inmetro, this accreditation was based on ILAC G13: 2007 and included several clinical and hemotherapy tests. In the periodic evaluations of this accreditation, new segments and tests are included and the evaluation is now conducted according to ABNT NBR ISO/IEC 17043.

This accreditation attests to Controllab’s technical competence to develop and conduct proficiency tests in accordance with international requirements and enables it to be recognized in other countries, in accordance with mutual recognition agreements signed by Brazil in Mercosur, the Americas and Europe.

Cgcre is signatory to the Mutual Recognition Arrangements of the International Laboratory Accreditation Cooperation (ILAC) and Interamerican Accreditation Cooperation (IAAC).