Magruder Proficiency Test Program

Focus on reports

Individual Lab Performance

Collective Lab Performance

Frank J. Sikora, Division of Regulatory Services University of Kentucky

New Orleans, Feb 2017

Z score 2 + - Robust mean Investigational Allowance + -

32.27

34.27

Control Charts

Collective Lab Performance

Guarantee Investigational Allowance + -

40.0

39.1

40.9

39.4

39.0

Guarantee

40.0

39.4

39.0

Lab Value Sum or Errors + -

S2 samp

S2 prep

+

Inter- and Intra- Lab Variance for Analyte

Sample 15011

Lab 1 Lab 2 Lab 3

Inter- and Intra- Lab Variance for Analyte