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Displaying records 11 to 20 of 116 records.
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11. Bayes Estimators of Heterogeneity Variance and T-Systems
Topic: Statistics
Published: 1/8/2014
Author: Andrew L Rukhin
Abstract: The considered problem concerns simultaneous inference for curve-confined natural parameters of independent, heterogeneous gamma-random variables with known shape parameters. The meta-analysis motivated loss function is suggested and some propertie ...

12. R implementation of a polyhedral approximation to a 3D set of points using the alpha-shape
Topic: Statistics
Published: 1/1/2014
Authors: Thomas Victor Emmanuel Lafarge, Beatriz Pateiro Lopez, Antonio M Possolo, Joy P Dunkers
Abstract: This work describes the implementation in R of the alpha-shape of a finite set of points in three-dimensional space. This geometric construct generalizes the convex hull and estimates the shape of non-convex and even non-connected sets in 3D, given r ...

13. Compatibility Verification of Certified Reference Materials and User Measurements
Topic: Statistics
Published: 12/9/2013
Author: Andrew L Rukhin
Abstract: A problem that frequently occurs in metrology is one of assessing compatibility of data obtained by a user laboratory with the specified values and uncertainty estimates from the certificate of analysis. The user‰s data are summarized by a measura ...

14. Allocating Attribute-Specific Information-Gathering Resources to Improve Selection Decisions
Topic: Statistics
Published: 12/8/2013
Authors: Dennis D Leber, Jeffery W Herrmann
Abstract: When collecting data to select an alternative from a finite set of alternatives that are described by multiple attributes, one must allocate effort to activities that provide information about the value of each attribute. This is a particularly rele ...

15. Testing Equality of Cell Populations Based on Shape and Geodesic Distance
Topic: Statistics
Published: 12/3/2013
Authors: Robert Charles Hagwood, Javier Bernal, Michael W Halter, John T Elliott
Abstract: Image cytometry has emerged as a valuable in-vitro screening tool and advances in automated microscopy have made it possible to readily analyze large cellular populations of image data. A statistical procedure to study homogeneity of such data ...

16. Decision Analysis Methods for Selecting Consumer Services with Attribute Value Uncertainty
Topic: Statistics
Published: 12/1/2013
Authors: Dennis D Leber, Jeffery W Herrmann
Abstract: The basic risky decision is defined as a decision for which an uncertain event, in addition to the alternative selected, defines the outcome. Beyond the uncertain event, additional uncertainties can enter a decision including the uncertainty in the ...

17. Neutron Tomography of a Fuel Cell: Statistical Learning Implementation of a Penalized Likelihood Method
Topic: Statistics
Published: 10/15/2013
Authors: Kevin J Coakley, Dominic F. (Dominic F.) Vecchia, Daniel S Hussey, David L Jacobson
Abstract: At the NIST Neutron Imaging Facility, we collect neutron projection data for both the dry and wet states of a Proton-Exchange-Membrane (PEM) fuel cell. Transmitted neutrons captured in a scintillator doped with Lithium-6 produce scintillation li ...

18. Applying the Hedonic Method
Series: Technical Note (NIST TN)
Report Number: 1811
Topic: Statistics
Published: 9/18/2013
Author: Stanley W Gilbert
Abstract: Often, advances in measurement science will enable the development of new product innovations. When trying to estimate the value of the benefits of an advance in measurement science, it can be difficult to estimate the value of those new product inn ...

19. Regional homogenization of surface temperature records using robust statistical methods
Topic: Statistics
Published: 9/12/2013
Authors: Adam L Pintar, Antonio M Possolo, Nien F Zhang
Abstract: An algorithm is described and applied to estimate and remove spurious influences from the surface temperature record at a meteorological station, which may be due to changes in the location of the station or in its environment, or in the method used ...

20. Statistical Analysis of Single PPTA Fibers
Topic: Statistics
Published: 7/28/2013
Authors: Nathanael A Heckert, Jae Hyun Kim, Kirk D Rice, Gale Antrus Holmes
Abstract: Discuss statistical methods used for analysis of single fiber tensile strength tests. Kernel density plots and quantile-quantile plots were used to graphically analyze the data. Fiber strength was modeled using 2-parameter Weibull, 3-parameter Weib ...

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