Statistics Meeting Book (May 15, 2019)

Sample B: Report

AOAC International Interlaboratory Study Workbook

Version:

4.1

Blind (Unmatched) Replicates Study Reported Values

Seq.

Item

Symbol

Value 95% LCL 95% UCL

Name of study: Date of study: Sample/Matrix ID: Analyte:

NIST Cucuminoids

1-Apr-2018

B

Curcumin 1.00E-03

Factor for Units of measurement: Metamer to analyze (C or pC): True value (blank if not known):

pC

0.085128182

1 Total number of laboratories 2 Total number of replicates

p

9

Sum(n(L)) XBARBAR

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3 Overall mean of all data (grand mean) 4 Repeatability standard deviation 5 Interlaboratory standard deivation 6 Bias estimate (Measured - True) DERIVED VALUES: 7 Reproducibility standard deviation 8 Root-mean-square-total-error 9 Repeatability relative standard deviation 10 Reproducibility relative standard deviation

0.0940 0.0793 0.1088 0.01519 0.01147 0.02246 0.01826 0.01233 0.03498

s(r) s(L)

b

0.0089

s(R) rmse

0.02375 0.0254

RSD(r) RSD(R)

11 HORRAT value

17

copyright 2018 by Least Cost Formulations, Ltd., all rights reserved.

Compare Samples A and B results

Quantity

A

B

Pooled

pAve pBias

1.9704 0.0134 0.0102 0.0435 0.0447

0.0940 0.0089 0.0152 0.0183 0.0238

0.0112 0.0130 0.0334 0.0358

pSD(r) pSD(L) pSD(R)

‘Pooled’ estimates combine A and B values. (Note that pooled values fall within confidence intervals for both A and B samples.)

18

copyright 2018 by Least Cost Formulations, Ltd., all rights reserved.