Abstract #301310

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JSM 2003 Abstract #301310
Activity Number: 164
Type: Topic Contributed
Date/Time: Monday, August 4, 2003 : 2:00 PM to 3:50 PM
Sponsor: Section on Physical and Engineering Sciences
Abstract - #301310
Title: Statistical Analysis of the CCPR Key Comparison on Near-infrared Spectral Responsivity
Author(s): Blaza Toman*+
Companies: NIST
Address: 321 Penwood Rd., Silver Spring, MD, 20901-2717,
Keywords: hierarchical model ; unbalanced design ; multiple comparisons
Abstract:

The CCPR, an international group of national standards laboratories, planned and carried out an experiment to establish the metrological equivalence of national measurement standards. The comparison was structured in a star pattern, a total of fifteen national laboratories participated in one of 4 rounds. Three indium gallium arsenide detectors were sent to each laboratory. The laboratory measured each detector three times over the spectral range from 900 nm to 1600 nm in 50 nm increments. NIST measured the photodetectors at the beginning and end of each comparison to establish their radiometric stability. This talk will present the statistical analysis of the data from this experiment. As is true for most designed experiments, various problems with the data collection made the final experimental design less desirable than was planned. For example, the final design is severely unbalanced. We will present approaches commonly used to analyze data from Key Comparisons and show that a Bayesian analysis, based on a hierarchical model with noninformative priors on the second stage, is superior in overcoming some of the problems presented by the design.

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Revised March 2003