Definition terms and ISo guides
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Dispersion of repeated measurement about the mean due to analytic error
Imprecision
Difference between a measured value and its true value due to systematic error, which can be either constant or proportional
Inaccuracy
Error always in one direction
Systematic error
Types of systemic error in the sample direction and magnitude; the magnitude of change is constant and not dependent on the amount of analyte
Constant error
Type of systemic error where the magnitude changes as percent of the analyte present, error dependet on analyte concentration
Proportional error
Error varies from sample to sample. Causes include instrument instability, temperature variations, reagent variation, handling techniques, and operator variables
Random error
Random error plus systemic error
Total error