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Search Publications by: Blaza Toman (Assoc)

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Displaying 51 - 75 of 86

Alternative Analyses of Measurements of the Planck Constant

July 5, 2012
Author(s)
Blaza Toman
We compare different methods for the adjustment of the Planck constant using recent, inconsistent data. First we discuss the popular Birge ratio method. By stating the underlying statistical model we critically assess and modify this method. We then

Quantifying Model Error

February 11, 2011
Author(s)
Kevin B. McGrattan, Blaza Toman
A methodology is proposed for reporting the results of fire model validation studies that consist mainly of comparisons of model predictions and experimental measurements. The difference between the two is a combination of model error and experimental

Laboratory Effects Models for Interlaboratory Comparisons

June 16, 2009
Author(s)
Blaza Toman, Antonio M. Possolo
Statistical analysis of inter-laboratory comparisons (e.g. Key Comparisons, Supplemental Comparisons) is required to produce an estimate of the measurand called a reference value and further, measures of equivalence of the participating laboratories

Three Statistical Paradigms for the Assessment and Interpretation of Measurement Uncertainty

January 12, 2009
Author(s)
William F. Guthrie, Hung-Kung Liu, Andrew L. Rukhin, Blaza Toman, Chih-Ming Wang, Nien F. Zhang
The goals of this chapter are to present different approaches to uncertainty assessment from a statistical point of view and to relate them to the methods that are currently being used in metrology or are being developed within the metrology community. The

Model Based Uncertainty Analysis in Inter-Laboratory Studies

June 23, 2008
Author(s)
Blaza Toman, Antonio M. Possolo
Statistical analysis of key comparison and inter-laboratory experiments is required to produce an estimate of the measurand called a reference value and further, measures of equivalence of the participating laboratories. Methods of estimation of the

Assessment of measurement uncertainty via observation equations

December 3, 2007
Author(s)
Antonio M. Possolo, Blaza Toman
According to the Guide to the Expression of Uncertainty in Measurement, measurement uncertainty is assessed by computational propagation of error based on a measurement equation that expresses the measurand as a known function of input variables. However

Comments on 'Bayesian evaluation of comparison data' by Ignacio Lira

January 1, 2007
Author(s)
Raghu N. Kacker, Blaza Toman
A recent paper by Ignacio Lira in Metrologia 43 (2006) S231-S234 addresses a well-known problem in combining information from interlaboratory evaluations. Lira presents an expression, which he claims to be the kernel of a Bayesian posterior probability

Uncertainty Analysis for Virtual Cement Measurement

September 13, 2006
Author(s)
Blaza Toman, Adriana Hornikova, Robert C. Hagwood, Hung-Kung Liu, Nien F. Zhang, Edward J. Garboczi, Jeffrey W. Bullard
Virtual measurements are the outputs of well-defined mathematical models based on theoretical principles and simulation algorithms. The VCCTL (Virtual Cement and Concrete Testing Laboratory) is a software system built by the Material and Construction

Analysis of Sensitivity of VCCTL Measurements to Various Input Quantities

August 9, 2006
Author(s)
Adriana Hornikova, Blaza Toman, Nien F. Zhang, Hung-Kung Liu, Robert C. Hagwood, Edward J. Garboczi, Jeffrey W. Bullard
Virtual measurements are the outputs of well-defined mathematical models based on theoretical principles and simulation algorithms. The VCCTL (Virtual Cement and Concrete Testing Laboratory) is a software system built by the Material and Construction