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Topic Area: Statistics

Displaying records 41 to 50 of 61 records.
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41. Random-Effects Model for Meta-analysis of Clinical Trials: An Update
Topic: Statistics
Published: 1/1/2007
Authors: Rebecca DerSimonian, Raghu N Kacker
Abstract: The random-effects model is a useful approach for meta-analysis of clinical studies. It explicitly accounts for the heterogeneity of studies through a statistical parameter representing the inter-study variation. We discuss several iterative and non- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51313

42. Bayesian Alternative to the Guide's Use of the Welch-Satterthwaite Formula
Topic: Statistics
Published: 1/3/2006
Author: Raghu N Kacker
Abstract: The Guide to the Expression of Uncertainty in Measurement suggests that to account for the statistical uncertainty in a combined standard uncertainty that arises when one or more of its components are evaluated from a limited number of independent no ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150900

43. Uncertainty Analysis for Vector Measurands Using Fiducial Inference
Topic: Statistics
Published: 1/1/2006
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: This paper presents a method for constructing uncertainty regions for a vector measurand in the presence of both type-A and type-B errors. The method is based on the principle of fiducial inference and generally requires a Monte Carlo approach for co ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150367

44. Soft Decision Metrics for Turbo-Coded FH M-FSK Ad Hoc Packet Radio Networks
Topic: Statistics
Published: 10/1/2005
Authors: B M Peric, Michael R Souryal, E G Larsson, B R Vojcic
Abstract: This paper addresses turbo-coded non-coherent FH M-FSK ad hoc networks with a Poisson distribution of interferers where multiple access interference can be modeled as symmetric a-stable (SaS) noise and a is inversely proportional to the path loss ex ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150118

45. 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

46. Uncertainty in Reference Values for the Charpy V-notch Verification Program
Topic: Statistics
Published: 5/1/2005
Authors: Jolene D Splett, Chih-Ming Wang
Abstract: We present a method for computing the combined standard uncertainty for reference values used in the Charpy machine verification program administered by the National Institute of Standards and Technology. The technique is compliant with the ISO GUM ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50807

47. Prediction and Three-Dimensional Monte-Carlo Simulation for Tensile Properties of Unidirectional Hybrid Composites
Topic: Statistics
Published: 4/1/2005
Authors: Martin Y Chiang, Xianfeng Wang, Carl R. Schultesiz
Abstract: A three-dimensional fiber tow-based analytical model incorporating shear-lag theory and a statistical strength distribution has been used to simulate the tensile properties and predict the tensile strength of unidirectional hybrid composites. The hy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852251

48. Soft-Decision Metrics for Coded Orthogonal Signaling in Symmetric Alpha-Stable Noise
Topic: Statistics
Published: 3/1/2005
Authors: Michael R Souryal, E G Larsson, B M Peric, B R Vojcic
Abstract: This paper derives new soft decision metrics for coded orthogonal signaling in symmetric a-stable noise, which has been used to model impulsive noise. In addition to the optimum metrics for Gaussian (a = 2) noise and Cauchy (a = 1) noise, a class of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50117

49. Models and Confidence Intervals for True Values in Interlaboratory Trials
Topic: Statistics
Published: 12/6/2004
Authors: 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

50. A New Design for High-Throughput Peel Tests: Statistical Analysis and Example
Topic: Statistics
Published: 12/1/2004
Authors: A Chiche, Weiping Zhang, Christopher M Stafford, Alamgir Karim
Abstract: The peel test is one of the most common techniques to investigate the properties of pressure sensitive adhesives (PSAs). As the demand increases for combinatorial tools to rapidly test material performance, designinig a high-throughput peel test is a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852395