Results 81 to 90 of about 91,138 (340)

Pairwise Likelihood Estimation of the 2PL Model with Locally Dependent Item Responses

Applied Sciences
The local independence assumption is crucial for the consistent estimation of item parameters in item response theory models. This article explores a pairwise likelihood estimation approach for the two-parameter logistic (2PL) model that treats the local
Alexander Robitzsch
doaj   +1 more source

Bootstrap Tests for Overidentification in Linear Regression Models

Econometrics, 2015
We study the finite-sample properties of tests for overidentifying restrictions in linear regression models with a single endogenous regressor and weak instruments.
Russell Davidson, James G. MacKinnon
doaj   +1 more source

Super-Consistent Tests of Lp-Functional Form [PDF]

This paper develops a consistent test of best Lp-predictor functional form for a time series process. By functionally relating two moment conditions with different nuisance parameters we are able to construct a vector moment condition in which at least ...
Jonathan Hill
core  

A Semiparametric Model Selection Criterion with Applications to the Marginal Structural Model [PDF]

, 2003
Estimators for the parameter of interest in semiparametric models often depend on a guessed model for the nuisance parameter. The choice of the model for the nuisance parameter can affect both the finite sample bias and efficiency of the resulting ...
Brookhart, M. Alan, van der Laan, Mark J.   +1 more
core   +1 more source

Disrupted Brain Structure and Function in Alzheimer's Disease Patients With Behavioral and Psychological Symptoms

iNew Medicine, EarlyView.
ABSTRACT Behavioral and psychological symptoms of dementia (BPSD) are highly prevalent in Alzheimer's disease (AD), but the underlying mechanisms are unclear. This study aims to elucidate the neuropathological mechanisms underlying BPSD by investigating gray matter volume (GMV) and brain connectivity in AD patients with and without BPSD.
Xuerui Pang, Linbo Xie, Mengdan Chen, Yi Ji, Yibing Yan, Shanshan Zhou, Panpan Hu, Xingqi Wu, Kai Wang   +8 more
wiley   +1 more source

ESTIMATION OF SCALE PARAMETER UNDER A REFLECTED GAMMA LOSS FUNCTION [PDF]

Journal of Sciences, Islamic Republic of Iran, 1999
In this paper, the estimation of a scale parameter t under a new and bounded loss function, based on a reflection of the gamma density function, is discussed.
doaj  

Semiparametric estimation for incoherent optical imaging

Physical Review Research, 2019
The theory of semiparametric estimation offers an elegant way of computing the Cramér-Rao bound for a parameter of interest in the midst of infinitely many nuisance parameters.
Mankei Tsang
doaj   +1 more source

The Limit of Finite-Sample Size and a Problem with Subsampling [PDF]

This paper considers inference based on a test statistic that has a limit distribution that is discontinuous in a nuisance parameter or the parameter of interest.
Donald W.K. Andrews, Patrik Guggenberger
core  

A common misapplication of statistical inference: nuisance control with null-hypothesis significance tests

, 2016
Experimental research on behavior and cognition frequently rests on stimulus or subject selection where not all characteristics can be fully controlled, even when attempting strict matching.
Alday, Phillip M., Sassenhagen, Jona
core   +1 more source

Revisiting EWMA in High‐Frequency‐Based Portfolio Optimization: A Comparative Assessment

Journal of Applied Econometrics, EarlyView.
ABSTRACT This paper compares the statistical and economic performance of state‐of‐the‐art high‐frequency (HF) based multivariate volatility models with a simpler, widely used alternative, the Exponentially Weighted Moving Average (EWMA) filter. Using over two decades of 100 U.S.
Laura Capera Romero, Anne Opschoor
wiley   +1 more source