Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Robert J. Boik"'
Autor:
Robert J. Boik, James F. Robinson-Cox
Publikováno v:
Journal of Statistical Software, Vol 3, Iss 1, Pp 1-20 (1998)
The incomplete beta function is defined as where Beta(p, q) is the beta function. Dutka (1981) gave a history of the development and numerical evaluation of this function. In this article, an algorithm for computing first and second derivatives of Ix
Externí odkaz:
https://doaj.org/article/15255a1bbfaa427693a1bfe28ba08ab6
Autor:
James F. Robison-Cox, Robert J. Boik
Publikováno v:
Journal of Statistical Software, Vol 3, Iss 1 (1998)
Externí odkaz:
https://doaj.org/article/54b7d91d752744cf86c2493ee547dc13
Autor:
Robert J. Boik
Publikováno v:
Journal of Multivariate Analysis. 116:310-331
A model for principal components of correlation matrices is proposed. The model satisfies the correlation constraint (i.e., unit valued diagonal elements) as well as optional constraints on eigenvalues and/or eigenvectors. The model yields simplified
Publikováno v:
British Journal of Mathematical and Statistical Psychology. 63:113-137
A flexible class of models is proposed for principal component (PCs) of covariance matrices. The models allow constraints to be imposed on the eigenvalues and/or the eigenvectors and yield simplified PCs that retain their variance maximization and or
Autor:
Robert J. Boik, Amin Shirvani
Publikováno v:
Statistical Methodology. 6:21-46
The coefficient of variation (CV) matrix for a p -dimensional random vector is the covariance matrix scaled by the p -vector of means such that the diagonal components are the squared coefficients of variation. In this article, principal component mo
Publikováno v:
Environmental and Ecological Statistics. 16:547-560
Estimates of a population’s growth rate and process variance from time-series data are often used to calculate risk metrics such as the probability of quasi-extinction, but temporal correlations in the data from sampling error, intrinsic population
An implicit function approach to constrained optimization with applications to asymptotic expansions
Autor:
Robert J. Boik
Publikováno v:
Journal of Multivariate Analysis. 99:465-489
In this article, an unconstrained Taylor series expansion is constructed for scalar-valued functions of vector-valued arguments that are subject to nonlinear equality constraints. The expansion is made possible by first reparameterizing the constrain
Publikováno v:
Statistics in Medicine. 27:1040-1061
Cancer drugs are commonly administered in the clinic in the form of mixtures, also called cocktails or combinations. Assessment of synergistic and antagonistic interactions between drugs is therefore an important aspect of cancer research. Numerous m
Autor:
Robert J. Boik
Publikováno v:
Psychometrika. 73:231-259
In this paper implicit function-based parameterizations for orthogonal and oblique rotation matrices are proposed. The parameterizations are used to construct Newton algorithms for minimizing differentiable rotation criteria applied to m factors and
Autor:
Robert J. Boik
Publikováno v:
Annals of the Institute of Statistical Mathematics. 60:61-83
A linear model in which random errors are distributed independently and identically according to an arbitrary continuous distribution is assumed. Second- and third-order accurate confidence intervals for regression parameters are constructed from Cha