Interlaboratory quality assurance program
US4858154A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1986 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Apr 7, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A90/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved procedure for statistically evaluating the performance, precision and/or accuracy, of at least one analytical instrument in a pool of like or substantially like instruments by comparing the performance of the one instrument located in one laboratory with the performance of like instruments in other laboratories. The procedure includes the step of quantitatively analyzing a reference or control specimen of known constituents by each instrument in the pool and collecting the resultant data from the one instrument in the pool and of the pool instruments. The mean data from the one instrument and of the pool instruments are mathematically correlated in a series of statistical equations for computing a novel, sensitive index known as the "Instrument Performance Index" or IPI. This IPI can be tabulated and/or graphically displayed, preferably as a single point in a Cartesian coordinate system, whereby an operator can tell at a glance the performance level with respect to both precision and accuracy of the one instrument in the pool. The ultimate IPI is composed of a novel Coefficient of Variation Index (CVI), which is a valuable measure of instrument precision, and the Standa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.