imprecision


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imprecision

(ĭm-prē-sĭ′shŭn)
The amount or degree of random error in an assay, research study, or calculation, usually represented by the standard deviation, coefficient of variation, or range.
References in periodicals archive ?
Thus, 100 patients were modeled for 100 h with each regimen with both the hourly and every-5-min measurement schemas under 45 combinations of simulated bias and imprecision.
showed (3), the maximum allowable bias and imprecision are interrelated, and they can be described in the curve presented in Fig.
The imprecision data from QC material obtained over the duration of the trial is summarized in Table 1, together with the imprecision data obtained from duplicate testing on patient samples in the closest corresponding bin.
A similar study that used different modeling techniques explored the effect of assay imprecision on the ROC area under the curve for prognosis by using cardiac troponin from the Gusto IIA trial (8).
1 is that total imprecision and random patient interferences have been separated.
The within-run imprecision (CV) and cardiac troponin I (cTnI) concentration pairs we derived from that study produce an SD profile that decreases slightly for cTnI concentrations of 0.
To assess the effect of increased assay imprecision on the estimate of the AUC and the SE of the AUC, we assumed that replicate measurements by a given assay of a sample with a fixed concentration of analyte followed a gaussian distribution and that the increase in assay CV was a constant percentage value across all concentrations within the measuring range of the assay.
1 are the probabilities of at least 1 of 3 serially measured values exceeding the 99th percentile limits as a function of the cTnI concentration for the 2 different imprecision profiles.
7 mmol/L produced a nonlinear significant decrease in measured tHcy concentrations of more than twice the total imprecision of the test on both analyzers.
These recommendations define specifications for the imprecision and inaccuracy of the respective methods, the total analytical error that is allowable, and the medical decision values.
Consistent data on cardiac troponin assay imprecision are often lacking in the peer-reviewed literature.