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Topic Area: Statistics

Displaying records 21 to 30 of 115 records.
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21. Uncertainty Machine --- User's Manual
Topic: Statistics
Published: 7/10/2013
Authors: Antonio M Possolo, Thomas Victor Emmanuel Lafarge
Abstract: NIST's Uncertainty Machine is a software application to evaluate the measurement uncertainty associated with an output quantity defined by a measurement model of the form y = f(x[1],...,x[n]), where the real-valued function f is specified fully and ...

22. Boltzmann's H-Function and Diffusion Processes
Topic: Statistics
Published: 5/15/2013
Authors: Steven P Lund, Joseph Bunton Hubbard, Michael W Halter
Abstract: There exists a generalization of Boltzmann's $H$-function that allows for non-uniformly populated stationary states which may exist far from thermodynamic equilibrium. Here we describe a method for obtaining a generalized or collective diffusion coef ...

23. Phase-coded volume holographic gratings for spatial-spectral imaging filters
Topic: Statistics
Published: 2/15/2013
Author: John Lu
Abstract: We present a design of phase contrast filters embedded in a three-dimensional (3D) pupil to form phase-coded volume holographic gratings (VHG) for spatial-spectral imaging. The phase-coded VHG improves image contrast and results in strong filtering p ...

24. Five Examples of Assessment and Expression of Measurement Uncertainty
Topic: Statistics
Published: 2/12/2013
Author: Antonio M Possolo
Abstract: It is a long accepted tenet of scientific practice that every measurement result ought to include a statement of uncertainty associated with the measured value, and that such uncertainty should be propagated to derivative products. It is also widely ...

25. Prediction-Based Model Selection For Bayesian Multiple Regression Models
Topic: Statistics
Published: 2/5/2013
Author: Adam L Pintar
Abstract: Model selection is an important part of model building for Bayesian linear models when the number of possible model terms is large. Most current approaches focus on posterior model probabilities or the deviance information criterion. This article pro ...

26. Assessing Conformity of Two Laboratories: Formulations as a Statistical Hypothesis Testing Problem
Topic: Statistics
Published: 1/9/2013
Author: Andrew L Rukhin
Abstract: A decision problem frequently occurring in metrology is that of compatibility of data obtained by two (or several) different laboratories, methods or instruments. Several statistical approaches to this conformity assessment problem are reviewed inclu ...

27. Two SVDs Suffice: Spectral decompositions for probabilistic topic modeling and latent Dirichlet allocation
Topic: Statistics
Published: 12/6/2012
Authors: Yi-Kai Liu, Animashree Anandkumar, Dean P. Foster, Daniel Hsu, Sham M. Kakade
Abstract: The problem of topic modeling can be seen as a generalization of the clustering problem, in that it posits that observations are generated due to multiple latent factors (e.g. the words in each document are generated as a mixture of several activ ...

28. Statistical Analysis of Reader Measurement Variability in Nodule Sizing with CT Phantom Imaging Data
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7879
Topic: Statistics
Published: 11/23/2012
Authors: John Lu, Charles D. Fenimore, Nicholas Petrick, Rongping Zeng, Marios A Gavrielides, David Clunie, Kristin Borradaile, Robert Ford, Hyun J. Grace Kim, Michael McNitt-Gray, Binsheng Zhao, Andrew Buckler
Abstract: RSNA has conducted a phantom quantitative imaging biomarker (QIBA) study to assess reader measurement variability of both spherical and non-spherical nodules using CT imaging. Statistical analysis of intra-reader and inter-reader variability of v ...

29. Fast Sequential Importance Sampling fo Estimate the Graph Reliability Polynomial
Topic: Statistics
Published: 11/5/2012
Authors: David G. Harris, Francis Sullivan, Isabel M Beichl
Abstract: The reliability polynomial of a graph measures the number of its connected subgraphs of various sizes. Algortihms based on sequential importance sampling (SIS) have been proposed to estimate a graph's reliahbility polynomial. We develop an improved ...

30. An Empirical Bayes Approach to Robust Variance Estimation: A Statistical Proposal for Quantitative Medical Image Testing
Topic: Statistics
Published: 10/23/2012
Authors: John Lu, Charles D. Fenimore
Abstract: The current standard for measuring tumor response using X-ray, CT and MRI is based on the response evaluation crite- rion in solid tumors (RECIST) which, while providing simplifications over previous (WHO) 2-D methods, stipulate four response categor ...

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