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b standard deviation of repeatability.
The following statistical characteristics were determined: limit of detection 0.8 mg/kg, limit of quantification 2.6 mg/kg, standard deviation of repeatability = 0.4 mg/kg, relative standard deviation of repeatability (coefficient of variation) 15%, correlation coeffizient 0.97, recovery 103%.
Using the t-factor method the standard deviation of repeatability was calculated to represent an uncertainty of measurement of 0.2 mg/kg (95% level) or 0.04 mg/kg (99% level).
The set targets for concentrations lower than 100 μg L−1 were standard deviation of repeatability (sr) below 10% and limit of repeatability (r) below 28%, while for concentrations higher than 100 μg L−1, sr below 7% and r below 20%.
The relative standard deviation of repeatability (RSDr) represents the absolute value of the coefficient of variation.
The repeatability limit (r) and the relative standard deviation of repeatability (RSDr) were calculated according to ISO 16140 norm (2003).
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However, undiluted samples analyzed by the DCC method showed large standard deviations of repeatability and SCC values lower than those by the DMSCC or FSCC methods, probably because of the high solids content in ovine milk.
The repeatability of the Dipstick Reader was very good; very low standard deviations of repeatability (sr) were obtained.
A sampling rate of 90 determinations/h was achieved; the relative standard deviation of analytical repeatability was <3.5%.
If this was removed, the standard deviation of the repeatability was approximately halved.
The comparatively large standard deviation of the repeatability was mainly due to one outlier of each plane in cups 1 and 6 (Table 2).
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