Proficiency testing: Aqueous ethanol

摘要

Statistical methods for use in proficiency testing by interlaboratory comparisons Paragraph 6: Determining the standard deviation for proficiency assessment: 1. Prescribed method, e.g. legislation; 2. By perception, i.e. the level of competence that it is desirable to achieve; 3. From a general model, e.g. the Horwitz curve; 4. From the results of a precision experiment: a standard method is used; 5. From data obtained in a round of a proficiency testing scheme, i.e. from participant results; 6. Comparison of precision values derived from a proficiency test with established values - long term results.