AOAC SPIFAN WPC ERP-Final Action Review (Nov. 2017)

2016.15 (Nov. 2017) - WPC-31 MLT-Final Action Review

FOR ERP USE ONLY DO NOT DISTRIBUTE

Table 2016.15F. Statistical analysis of data for the two practice samples (15 laboratories, 5 models of instrument)

Statistical Parameters

Practice SX1

Practice SX2

Total number of laboratories Total number of replicates

p

p

15 29

15 29

Sum(n(L)) XBARBA R

Sum(n(L)) XBARBA R

Overall mean of all data (grand mean)

41.72

60.08

Largest average lab result Smallest average lab result

Max Min

Max Min

44.87 39.45

61.98 58.09

Repeatability standard deviation Reproducibility standard deviation Repeatability relative standard deviation

s(r)

s(r)

0.43 1.63 1.04 3.92 2.28 1.72

0.49 1.20 0.81 2.01 2.16 0.93

s(R)

s(R)

RSD(r)

RSD(r) RSD(R) % RSDH

Reproducibility relative standard deviation RSD(R)

Horwitz RSD HORRAT value

% RSDH

HorRat

HorRat