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Displaying records 61 to 70 of 106 records.
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61. Limit of detection determination for censored samples.
Topic: Statistics
Published: 1/11/2011
Author: Andrew L Rukhin
Abstract: The problem of setting the limit of detection is considered for censored samples and heterogeneous errors. After formal definitions of the critical level and of the method detection limit, we introduce simplified maximum likelihood-type estimators ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906715

62. Linking the Results of CIPM and RMO Key Comparisons with Linear Trends
Series: Journal of Research (NIST JRES)
Topic: Statistics
Published: 6/30/2010
Author: Nien F Zhang
Abstract: A statistical approach to link the results of interlaboratory comparisons with linear trends is proposed. This approach can be applied to the case that the comparisons have the same nominal values or of a same magnitude. The degrees of equivalence be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902845

63. Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Interlaboratory Comparison of Mixtures of Polystyrene With Different End Groups: Statistical Analysis of Mass Fractions and Mass Moments
Topic: Statistics
Published: 7/1/2005
Authors: Charles Martin Guttman, S Wetzel, Kathleen M. Flynn, B M Fanconi, David Lloyd VanderHart, William E Wallace III
Abstract: A matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) interlaboratory comparison was conducted on mixtures of synthetic polymers having the same repeat unit and closely matching molecular mass distributions but ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852470

64. Maximum Likelihood and Restricted Likelihood Solutions in Multiple-Method Studies
Series: Journal of Research (NIST JRES)
Topic: Statistics
Published: 1/31/2011
Author: Andrew L Rukhin
Abstract: A formulation of the problem of combining data from several sources is discussed in terms of random effects models. The unknown measurement precision is not supposed to be constant among laboratories whose summary results may seem not to conform to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906278

65. Model Selection for Good Estimation and Prediction Over a User-Speci ed Covariate Distribution for Linear Models Under the Frequentist Paradigm
Topic: Statistics
Published: 10/26/2011
Author: Adam L Pintar
Abstract: Model selection is an important part of estimation and prediction for linear models with multiple explanatory variables (covariates). A variety of approaches exist that focus on estimation of model parameters or the t of the model where data have be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908794

66. Models and Confidence Intervals for True Values in Interlaboratory Trials
Topic: Statistics
Published: 12/6/2004
Authors: Hariharan K. (Hariharan K.) Iyer, Chih-Ming Wang, T Mathew
Abstract: We consider the one-way random effects model with unequal sample sizes and heterogeneous variances. Using the method of generalized confidence intervals, we develop a new confidence interval procedure for the mean. Additionally, we investigate two ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51088

67. Monte-Carlo Simulation for the Fracture Process And Energy Release Rate of Unidirectional Carbon Fiber-Reinforced Polymers at Different Temperatures
Topic: Statistics
Published: 1/1/2004
Authors: X Wang, Martin Y Chiang, Chad R Snyder
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853957

68. My experience as a Commerce Science and Technology Fellow on Capitol Hill
Topic: Statistics
Published: 12/31/2008
Author: Ana I. Aviles
Abstract: How did I age a decade in less than a year? I worked for a Member of Congress and I made the most of my time on Capitol Hill! For ten months I served as primary advisor to Congressman Fortu o (R-PR) on science, space, technology, and telecommunicat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900201

69. NIST-Sponsored Interlaboratory Comparison of Polystyrene Molecular Mass Distribution Obtained by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry: Statistical Analysis
Topic: Statistics
Published: 3/1/2001
Authors: Charles Martin Guttman, S Wetzel, William R. Blair, B M Fanconi, Kathleen M. Flynn, R J Goldschmidt, William E Wallace III, David Lloyd VanderHart
Abstract: Matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS) is becoming a new and important technique in synthetic polymer characterization. Yet much is still unknown about the molecular mass distribution (MWD) which ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851614

70. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911455



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