Journal Published Online: 01 January 1997
Volume 25, Issue 1

Calibrating Instrument Readings Using a Bivariate Confidence Interval



A method of calibration that establishes a new bound of confidence for instrument measurements is derived and applied. This bound is named the McDonald-Trautner Interval (MTI). The derivation of the MTI incorporates the bivariate probability distributions of each data point conventionally used to form a regression line. A statistically significant number of parameter measurements on a sample must be made by both the instrument being calibrated and the calibrating medium. When calibration is based solely on regression analysis, the calibrating medium is assumed to be 100% reliable. The MTI includes the variability of the medium. The method is demonstrated on the calibration of a heavy metal detector. The calibrating medium is a chemical process. Compared to the conditional standard deviation bounds of linear regression, it is found that the MTI is a simple means to obtain a more statistically rigorous calibration procedure and is a better indication of the expected value of a variable.

Author Information

McDonald, BJ
The University of Toledo, Toledo, OH
Trautner, JJ
University of Utah, Salt Lake City, UT
Pages: 5
Price: $25.00
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Stock #: JTE11322J
ISSN: 0090-3973
DOI: 10.1520/JTE11322J