Reference materials

Webshop order
Webshop quotation

Samples from previous Proficiency tests are being sold as reference materials and can be used for method development or as reference samples for internal quality control. The samples are accompanied by a “Certificate of Analysis” providing information gathered from the results of the WEPAL-QUASIMEME PT schemes, such as:

  • the consensus value: the mean value of the dataset obtained from the PT, calculated with robust statistics
  • the standard deviation and coefficient of variation
  • number of results used to calculate the consensus value
  • median and MAD (Median of Absolute Deviation)
  • relative uncertainty and uncertainty of the consensus value

Please note: For samples found to be very stable (>10 years), the information on the certificates of analysis includes data from the last five PT rounds in which the sample was used. For less stable samples, the certificates of analysis contain only the most recent data.

Fees depend on your choice. Participants of the WEPAL-QUASIMEME programmes are entitled to a discount.

GA--20160829-752_6973-1500x1000px.jpg