نتایج جستجو برای: bootstrap method

تعداد نتایج: 1638077  

1999
Tim Hesterberg

Bootstrap tilting con dence intervals could be the method of choice in many applications for reasons of both speed and accuracy With the right implementation tilting intervals are times as fast as bootstrap BC a limits in terms of the number of bootstrap samples needed for comparable simulation accuracy Thus bootstrap samples might su ce instead of Tilting limits have other desirable properties...

2006
Kun-Lin Hsieh Yan-Kwang Chen

This paper introduces the confidence interval estimate for measuring the bullwhip effect, which has been observed across most industries. Calculating a confidence interval usually needs the assumption about the underlying distribution. Bootstrapping is a non-parametric, but computer intensive, estimation method. In this paper, a simulation study on the behavior of the 95% bootstrap confidence i...

ژورنال: پژوهش های ریاضی 2015
Iranpanah , N., Mikelani , P,

One of the main goals of studying the time series is estimation of prediction interval based on an observed sample path of the process. In recent years, different semiparametric bootstrap methods have been proposed to find the prediction intervals without any assumption of error distribution. In semiparametric bootstrap methods, a linear process is approximated by an autoregressive process. The...

Journal: :Adv. Data Analysis and Classification 2010
Stefan Van Aelst Gert Willems

We consider the problem of optimally separating two multivariate populations. Robust linear discriminant rules can be obtained by replacing the empirical means and covariance in the classical discriminant rules by S or MM-estimates of location and scatter. We propose to use a fast and robust bootstrap method to obtain inference for such a robust discriminant analysis. This is useful since class...

حجت اله, زراعتی , غلام رضا, بابایی , فریدون, معماری , محمد, بنی اسدی ,

Background and Aim: The purpose of this study was to assess the accuracy of the bootstrap method in logistic regression and to explore the method's use in logistic regression models in cases where the sample size is insufficient. Materials and Methods: We use data from 150 patients who had undergone surgery at the Cancer Institute, Emam Khomeini hospital during from 1999 to 2001. Then we drew...

Journal: :Computer Vision and Image Understanding 2011
Jan Kybic Claudia Nieuwenhuis

We address the problem of estimating the uncertainty of optical flow algorithm results. Our method estimates the error magnitude at all points in the image. It can be used as a confidence measure. It is based on bootstrap resampling, which is a computational statistical inference technique based on repeating the optical flow calculation several times for different randomly chosen subsets of pix...

M. Mohammadzadeh

The statistical analysis of spatial data is usually done under Gaussian assumption for the underlying random field model. When this assumption is not satisfied, block bootstrap methods can be used to analyze spatial data. One of the crucial problems in this setting is specifying the block sizes. In this paper, we present asymptotic optimal block size for separate block bootstrap to estimate the...

Journal: :Journal of the American Statistical Association 2016
Aaron Fisher Brian Caffo Brian Schwartz Vadim Zipunnikov

Many have suggested a bootstrap procedure for estimating the sampling variability of principal component analysis (PCA) results. However, when the number of measurements per subject (p) is much larger than the number of subjects (n), calculating and storing the leading principal components from each bootstrap sample can be computationally infeasible. To address this, we outline methods for fast...

In this study population dynamic of Acipenser persicus with age structure model by Monte Carlo and Bootstrap approach was studied. Length frequency data a total of 4376 specimens collected from beach seine, fixed gill net and conservation force in coastal Guilan province during 2002 to 2012. Data imported to FiSAT II for length frequency analyze by ELEFAN 1. K, L∞ and t0 estimated 203, 0.08 and...

Journal: :Molecular phylogenetics and evolution 2010
Jennifer Ripplinger Zaid Abdo Jack Sullivan

Bipartition support in maximum-likelihood (ML) analysis is most commonly assessed using the nonparametric bootstrap. Although bootstrap replicates should theoretically be analyzed in the same manner as the original data, model selection is almost never conducted for bootstrap replicates, substitution-model parameters are often fixed to their maximum-likelihood estimates (MLEs) for the empirical...

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