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Displaying records 81 to 90 of 107 records.
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81. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911704

82. 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

83. Randomness Testing of the Advanced Encryption Standard Candidate Algorithms
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6390
Topic: Statistics
Published: 9/1/1999
Author: Juan Soto
Abstract: One of the criteria used to evaluate the Advanced Encryption Standard candidate algorithms was their demonstrated suitability as random number generators. That is, the evaluation of their output utilizing statistical tests should not provide any mean ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151193

84. Randomness Testing of the Advanced Encryption Standard Finalist Candidates
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6483
Topic: Statistics
Published: 4/1/2000
Authors: Juan Soto, Lawrence E Bassham
Abstract: Mars, RC6, Rijndael, Serpent and Twofish were selected as finalists for the Advanced Encryption Standard (AES). To evaluate the finalists' suitability as random number generators, empirical statistical testing is commonly employed. Although it widely ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151216

85. Reducing Data Nonconformity in Linear Models
Topic: Statistics
Published: 1/3/2011
Author: Andrew L Rukhin
Abstract: Stein phenomenon Summary Several procedures designed to reduce nonconformity in interlaboratory studies by shrinking data toward a consensus matrix weighted mean are suggested. Some of them are shown to have a smaller quadratic risk than the vector s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905278

86. Restricted Likelihood Representation for Multivariate Heterogeneous Random Effects Models
Topic: Statistics
Published: 1/31/2014
Author: Andrew L Rukhin
Abstract: In the random-effects model of meta-analysis for heterogeneous multidimensional data a canonical representation of the restricted likelihood function is obtained. This representation is related to a linear data transform which is based on the algebr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914696

87. Sensitivities and Variances for Fitted Parameters of Spheres
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7616
Topic: Statistics
Published: 7/1/2009
Authors: Christoph Johann Witzgall, Marek Franaszek
Abstract: Experimental data have been gathered by applying 3D imaging systems, such as LIDAR/LADAR instruments, to spherical objects. This report provides a compilation of the statistical and analytical procedures to be used for an evaluation, to be reported ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903340

88. Sequential Testing to Guarantee The Necessary Sample Size in Clinical Trials
Topic: Statistics
Published: 1/1/2010
Author: Andrew L Rukhin
Abstract: The paper addresses the sequential sampling issues related to attainment of a given number of events in a Poisson process. The problem of guaranteeing the necessary sample size is formulated as that of open-ended hypothesis testing in which one has ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901446

89. Simultaneous Estimation and Reduction of Nonconformity in Interlaboratory Studies
Topic: Statistics
Published: 8/8/2012
Authors: Andrew L Rukhin, William E Strawderman
Abstract: Several procedures designed to reduce nonconformity in interlaboratory studies by shrinking data toward a consensus weighted mean are suggested. Some of them are shown to have a smaller quadratic risk than the vector sample mean. Shrinkage toward a w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901157

90. 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



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