Poor concordance of the clinical analysis results from different measurement procedures can also be attributed to the matrix differences for the reference materials, the diluents used, and the impact of dilution on the measurand
2 Measurement uncertainty (MU) is defined in ISO Guide to Expression of Uncertainty in Measurement (GUM) as a parameter associated with the result of a measurement, which characterises the dispersion of the values that could reasonably be attributed to the measurand
Composed in many cases, the measurand
y is not measured directly, but is determined from input quantities xi by a measurement function:
13) This definition expresses the first critically important quality of measurement-derived data: the measurand
is the quantity or object intended to be measured, but because all measurement is never free of error, no matter how exactingly it is performed, there is always some variance between the resulting data and (the epistemologically unknowable) ground truth.
Since the measurement procedures included in a commutability study must have similar selectivity for the measurand
, we speculate that most materials in the Korzun et al.
It is unlikely that repeated measurements of any measurand
results in exactly the same value (Senol, 2004; Majeske, 2008; Woodal & Borror, 2008; Automotive Industry Action Group [AIAG], 2010; Al-Refaie & Bata, 2010; Wang & Chien, 2010; Peruchi, Balestrassi, Paiva, Ferreira, & Carmelossi, 2013).
Chosen measurement strategy involved fitting simple geometry objects where both outer and inner diameters were fitted with cylinders, using Gaussian approach; length was measured as a distance between two planes; parallelism was observed as a geometrical measurand
of two planes, and coaxiality was observed between outer and inner cylinders (Table 4).
Repeatability: Closeness of the agreement between the results of successive measurements of the same measurand
carried out under the same conditions of measurement
Measurement uncertainty is the dispersion of values that could reasonably be attributed to the measurand
(quantity intended to be measured).
L-K10) between national metrology institutes was initiated to provide a basis for demonstrating equivalence of national realizations having taken into consideration only the 633 nm HeNe standards: the measurand
of the comparison was the difference of the average frequency of the hyperfine components d, e, f, and g in the [.
It is noted that the measurand
S is often assumed to be bivariate normal distributed on the origin of a complex plane for repeated measurements [10, 12].
This method is based on a comparison of the measurand
and standard angle determining a deviation between those angles.