Statistica Neerlandica最新文献

{"title":"Nonlinear shrinkage test on a large‐dimensional covariance matrix","authors":"Taras Bodnar, Nestor Parolya, Frederik Veldman","doi":"10.1111/stan.12348","DOIUrl":"https://doi.org/10.1111/stan.12348","url":null,"abstract":"This paper is concerned with deriving a new test on a covariance matrix which is based on its nonlinear shrinkage estimator. The distribution of the test statistic is deduced under the null hypothesis in the large‐dimensional setting, that is, when with variables and samples both tending to infinity. The theoretical results are illustrated by means of an extensive simulation study where the new nonlinear shrinkage‐based test is compared with existing approaches, in particular with the commonly used corrected likelihood ratio test, the corrected John test, and the test based on the linear shrinkage approach. It is demonstrated that the new nonlinear shrinkage test possesses better power properties under heteroscedastic alternative.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"45 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regression estimation using surrogate responses obtained by presmoothing","authors":"Eni Musta, Valentin Patilea, Ingrid Van Keilegom","doi":"10.1111/stan.12351","DOIUrl":"https://doi.org/10.1111/stan.12351","url":null,"abstract":"Presmoothing was initially introduced in the linear regression setting as a method to improve finite sample efficiency by replacing the response variable with a nonparametric estimate of the regression function. Since then, it has found success in various domains, including survival analysis. However, the use of presmoothing with multiple continuous covariates is challenging and undesirable in practice. Inspired by the cure regression setup, we derive a simple estimator for (semi)parametric models with many regressors based on 1‐dimensional presmoothing. The method is particularly valuable when the response variable is not directly observed. However, even when the response is available, presmoothing can enhance accuracy for small to moderate sample sizes. We present several applications of the proposed method in different settings and investigate its finite sample behavior through simulations.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"10 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hurdle GARCH models for nonnegative time series","authors":"Šárka Hudecová, Michal Pešta","doi":"10.1111/stan.12349","DOIUrl":"https://doi.org/10.1111/stan.12349","url":null,"abstract":"The studied semi‐continuous time series contains a nonnegligible portion of observations equal to a single value (typically zero), whereas the remaining outcomes are strictly positive. A novel class of hurdle GARCH models having dependent zero occurrences is considered and the classical maximum likelihood estimation is employed. However, a distribution of the underlying time series innovations does not belong into the exponential family, which together with the dependence of innovations makes the whole inference nonstandard. Consistency and asymptotic normality of the estimator are derived. Efficiency of the estimation is elaborated and compared with the alternative quasi‐likelihood approach. A bootstrap prediction is also discussed. An analysis of sparse nonlife insurance claims is performed.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"247 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Endogenous and exogenous effects in self‐exciting process models of terrorist activity","authors":"Fabrizio Ruggeri, Michael D. Porter, Gentry White","doi":"10.1111/stan.12347","DOIUrl":"https://doi.org/10.1111/stan.12347","url":null,"abstract":"A model based on the cluster process representation of the self‐exciting process model is derived to allow for variation in the excitation effects for terrorist events in a self‐exciting or cluster process model. The model's derivation and implementation details are given and applied to data from the Global Terrorism Database (National Consortium for the Study of Terrorism and Responses to Terrorism (START), 2015) from 2000 to 2013. Results regarding the practical interpretation and implications for a theoretical model paralleling existing criminological theory are discussed.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"28 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A note on trigonometric regression in the presence of Berkson‐type measurement error","authors":"Michael T. Gorczyca, Tavish M. McDonald, Justice D. Sefas","doi":"10.1111/stan.12344","DOIUrl":"https://doi.org/10.1111/stan.12344","url":null,"abstract":"In this note, we study how parameter vector estimation for a trigonometric regression model and the expected squared residual error computed from an estimated model are affected by Berkson‐type measurement error. Closed‐form expressions for the parameter vector and the expected squared residual error are obtained by assuming that the observed covariate data are sampled from an equispaced design and that measurement error is generated from a symmetric probability distribution with a mean of zero. Notably, these results indicate that estimates of the amplitude parameters for a trigonometric regression model suffer from attenuation bias when covariate data are mis‐measured, and that estimates of the phase‐shift parameters are unbiased.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"80 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Testing for no effect in regression problems: A permutation approach","authors":"Michał G. Ciszewski, Jakob Söhl, Ton Leenen, Bart van Trigt, Geurt Jongbloed","doi":"10.1111/stan.12346","DOIUrl":"https://doi.org/10.1111/stan.12346","url":null,"abstract":"Often the question arises whether can be predicted based on using a certain model. Especially for highly flexible models such as neural networks one may ask whether a seemingly good prediction is actually better than fitting pure noise or whether it has to be attributed to the flexibility of the model. This paper proposes a rigorous permutation test to assess whether the prediction is better than the prediction of pure noise. The test avoids any sample splitting and is based instead on generating new pairings of . It introduces a new formulation of the null hypothesis and rigorous justification for the test, which distinguishes it from the previous literature. The theoretical findings are applied both to simulated data and to sensor data of tennis serves in an experimental context. The simulation study underscores how the available information affects the test. It shows that the less informative the predictors, the lower the probability of rejecting the null hypothesis of fitting pure noise and emphasizes that detecting weaker dependence between variables requires a sufficient sample size.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"20 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High‐dimensional sparse classification using exponential weighting with empirical hinge loss","authors":"The Tien Mai","doi":"10.1111/stan.12342","DOIUrl":"https://doi.org/10.1111/stan.12342","url":null,"abstract":"In this study, we address the problem of high‐dimensional binary classification. Our proposed solution involves employing an aggregation technique founded on exponential weights and empirical hinge loss. Through the employment of a suitable sparsity‐inducing prior distribution, we demonstrate that our method yields favorable theoretical results on prediction error. The efficiency of our procedure is achieved through the utilization of Langevin Monte Carlo, a gradient‐based sampling approach. To illustrate the effectiveness of our approach, we conduct comparisons with the logistic Lasso on simulated data and a real dataset. Our method frequently demonstrates superior performance compared to the logistic Lasso.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"50 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141150754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Duals of convolution thinned relationships","authors":"M. C. Jones","doi":"10.1111/stan.12337","DOIUrl":"https://doi.org/10.1111/stan.12337","url":null,"abstract":"In a recent article, J. Peyhardi gives a number of novel results related to quasi Pólya thinning which encompass a number of important mixture relationships between univariate discrete distributions. In this note, I explore the duals of the general results on convolution thinning given in Peyhardi's Theorem 1 in order to obtain new relationships and to gain new insights into old relationships. Some consequences—for integer‐valued autoregressive processes—and analogues—in the continuous case—are noted.","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140197893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation and convergence rates in the distributional single index model","authors":"Fadoua Balabdaoui, Alexander Henzi, Lukas Looser","doi":"10.1111/stan.12336","DOIUrl":"https://doi.org/10.1111/stan.12336","url":null,"abstract":"The distributional single index model is a semiparametric regression model in which the conditional distribution functions <mjx-container aria-label=\"upper P left parenthesis upper Y less than or equals y vertical bar upper X equals x right parenthesis equals upper F 0 left parenthesis theta 0 left parenthesis x right parenthesis comma y right parenthesis\" ctxtmenu_counter=\"0\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"><mjx-math aria-hidden=\"true\"><mjx-semantics><mjx-mrow data-semantic-children=\"36,34\" data-semantic-content=\"10\" data-semantic- data-semantic-role=\"equality\" data-semantic-speech=\"upper P left parenthesis upper Y less than or equals y vertical bar upper X equals x right parenthesis equals upper F 0 left parenthesis theta 0 left parenthesis x right parenthesis comma y right parenthesis\" data-semantic-type=\"relseq\"><mjx-mrow data-semantic-children=\"0,27\" data-semantic-content=\"35,0\" data-semantic- data-semantic-parent=\"37\" data-semantic-role=\"simple function\" data-semantic-type=\"appl\"><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-operator=\"appl\" data-semantic-parent=\"36\" data-semantic-role=\"simple function\" data-semantic-type=\"identifier\"><mjx-c></mjx-c></mjx-mi><mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"appl\" data-semantic-parent=\"36\" data-semantic-role=\"application\" data-semantic-type=\"punctuation\" style=\"margin-left: 0.056em; margin-right: 0.056em;\"><mjx-c></mjx-c></mjx-mo><mjx-mrow data-semantic-children=\"26\" data-semantic-content=\"1,9\" data-semantic- data-semantic-parent=\"36\" data-semantic-role=\"leftright\" data-semantic-type=\"fenced\"><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"27\" data-semantic-role=\"open\" data-semantic-type=\"fence\" style=\"margin-left: 0.056em; margin-right: 0.056em;\"><mjx-c></mjx-c></mjx-mo><mjx-mrow data-semantic-children=\"24,5,25\" data-semantic-content=\"5\" data-semantic- data-semantic-parent=\"27\" data-semantic-role=\"sequence\" data-semantic-type=\"punctuated\"><mjx-mrow data-semantic-children=\"2,4\" data-semantic-content=\"3\" data-semantic- data-semantic-parent=\"26\" data-semantic-role=\"inequality\" data-semantic-type=\"relseq\"><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"24\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c></mjx-c></mjx-mi><mjx-mo data-semantic- data-semantic-operator=\"relseq,≤\" data-semantic-parent=\"24\" data-semantic-role=\"inequality\" data-semantic-type=\"relation\" rspace=\"5\" space=\"5\"><mjx-c></mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"24\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c></mjx-c></mjx-mi></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"punctuated\" data-semanti","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"20 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140172068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of the incubation time distribution in the singly and doubly interval censored model","authors":"Piet Groeneboom","doi":"10.1111/stan.12335","DOIUrl":"https://doi.org/10.1111/stan.12335","url":null,"abstract":"We analyze nonparametric estimators for the distribution function of the incubation time in the singly and doubly interval censoring model. The classical approach is to use parametric families like Weibull, log‐normal or gamma distributions in the estimation procedure. We propose nonparametric estimates for functions of the observations, which stay closer to the data than the classical parametric methods. We also give explicit limit distributions for discrete versions of the models and apply this to compute confidence intervals. The methods complement the analysis of the continuous model in Groeneboom (2021, 2023). <jats:styled-content>R</jats:styled-content> scripts for computation of the estimates are provided in Groeneboom (2020).","PeriodicalId":51178,"journal":{"name":"Statistica Neerlandica","volume":"54 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}