Journal of Computational & Graphical Statistics articles from September 2001

Journal of Computational & Graphical Statistics archives from September 2001

Computational Algorithms for Censored-Data Problems Using Intersection Graphs.(Statistical Data Included)
September 1, 2001... This article presents methods for finding the nonparametric maximum likelihood estimate (NPMLE) of the distribution function of time-to-event data. The basic approach is to use graph theory (in particular intersection graphs) to simplify the...

Implementations of the Monte Carlo EM Algorithm.
September 1, 2001... The Monte Carlo EM (MCEM) algorithm is a modification of the EM algorithm where the expectation in the E-step is computed numerically through Monte Carlo simulations. The most flexible and generally applicable approach to obtaining a Monte...

Mixtures of Gamma Distributions With Applications.
September 1, 2001... This article proposes a Bayesian density estimation method based upon mixtures of gamma distributions. It considers both the cases of known mixture size, using a Gibbs sampling scheme with a Metropolis step, and unknown mixture size, using a...

A Note on Optimal Matching With Variable Controls Using the Assignment Algorithm.
September 1, 2001... The assignment algorithm is an old, well-known, widely implemented, fast, combinatorial algorithm for optimal matching in a bipartite graph. This note proposes a method for using the assignment algorithm to solve the problem of optimal matching...

Hierarchical Model-Based Clustering for Large Datasets.
September 1, 2001... In recent years, hierarchical model-based clustering has provided promising results in a variety of applications. However, its use with large datasets has been hindered by a time and memory complexity that are at least quadratic in the number...

A Probabilistic Expert System for Automatic Musical Accompaniment.
September 1, 2001... This article presents methodology that allows a computer to play the role of musical accompanist in a nonimprovised musical composition for soloist and accompaniment. The modeling of the accompaniment incorporates a number of distinct knowledge...

A Unified Approach to Outliers, Influence, and Transformations in Discriminant Analysis.
September 1, 2001... This article extends the analysis of multivariate transformations to linear and quadratic discriminant analysis. It shows that the standard application of deletion diagnostic techniques for validating a particular transformation suffers from...

Sampling Schemes for Model Visualization.
September 1, 2001... This article illustrates a technique for visualizing nonlinear mappings f : [R.sup.k] [right arrow] [R.sup.m] that arise frequently in engineering applications. The idea is based on viewing sections [f.sup.-1] (B) of the domain [R.sup.k], and...

Can Data Recognize Its Parent Distribution?
September 1, 2001... This study is concerned with model selection of lifetime and survival distributions arising in engineering reliability or in the medical sciences. We compare various distributions--including the gamma, Weibull, and lognormal--with a new...

Cross-Validating Non-Gaussian Data: Generalized Approximate Cross-Validation Revisited.
September 1, 2001... This article presents an alternative derivation of the generalized approximate cross-validation (GACV) score of Xiang and Wahba (1996) for smoothing parameter selection in penalized likelihood regression. The new derivation suggests a simple...

Nonparametric Estimation of Hazard Rate Under the Constraint of Monotonicity.
September 1, 2001... This article shows how to smoothly "monotonize" standard kernel estimators of hazard rate, using bootstrap weights. Our method takes a variety of forms, depending on choice of kernel estimator and on the distance function used to define a...

Correction.
September 1, 2001... In the June issue of the Journal of Computational and Graphical Statistics an article was inadvertently omitted from the table of contents. The article is de Luna, Xavier, and Genton, Marc G. (2001), "Robust Simulation-Based Estimation of...

Recent Publications in JSS.(Journal of Statistical Software)(Brief Article)
September 1, 2001... The following abstract comes from a paper recently accepted to the Journal of Statistical Software (JSS). JSS is free; code and papers may be downloaded at no cost. Code means source code, not binaries, so that algorithms may be easily...