Precision estimates produced by specially-designed ruggedness tests compared with those derived from collaborative trials, in relation to estimation of measurement uncertainty.
We have compared the reproducibility precisions provided by collaborative trials with precisions obtained from ruggedness tests specially designed to try to simulate between-laboratory variation. We found that the ruggedness tests underestimated the reproducibility variability consistently for those analytical methods requiring empirical calibration. The ruggedness tests provided on average a precision merely comparable with repeatability precision. This finding has implications for the estimation of uncertainty.
Thompson
Michael
M
School of Biological and Chemical Sciences, Birkbeck College (University of London), Gordon House, 29 Gordon Square, London, UK WC1H 0PP.
Guffogg
Stephen
S
Stangroom
Stephen
S
Osborne
Paula
P
Key
Pauline
P
Wood
Roger
R
D005504:Food Analysis / Q000379:methods*; D007753:Laboratories; D015203:Reproducibility of Results