Author(s)

Ruixuan Liu, Hongwei Wang, Jia Luo, Chao Wan

Corresponding Author

Ruixuan Liu

Abstract

In the paper the Proficiency Testing of the total number of bacteriain 34 laboratories were Analyzed and Counted. Z-score number were determined by statistical method. The Z-score was a standardized value assigned to each result. The testing results of 34 participating laboratories were evaluated. 3 laboratories with a Z-score of greater than 3 were unqualified results; 2 laboratories with a Z-score of less than 3 and greater than 2 were suspicious results.

Keywords

The total number of bacteria, Proficiency testing, Robust statistical analysis, Z-score