Results 101 to 110 of about 1,633 (190)

International Conference on Computer Systems and Technologies- CompSysTech’07 Some Models of a Distributed Database Management System with Data Replication

, 2008
: The article suggests a formal model of Distributed Database Management Systems (DDBMS) and an approach for Distributed Database Systems (DDB) modeling. It is suggested to use general purpose system simulation (GPSS) for simulation modeling.
Petar Milev, Borislav Stoyanov, Svetlana Vasileva   +2 more
core  

Research on the Concurrency Control Communications Protocol in BioMedical Information Service System

, 2011
In allusion to the transaction trait of the object-oriented mobile real-time database in the biomedical information service system, the new concurrency control communications protocol (PAI-OM-2PL) is put up with the fusion of common object two stages ...
Bo Wang, Jing Zhi Tian, Xiao Xin Du
core   +1 more source

Concurrency control model based on distributed high priority two phase locking for distributed real-time database system

, 2004
介绍了几种用于RTDBS(实时数据库系统)中的并发控制模型以及它们在分布式环境下(DRTDBS)的拓展。根据DHP-2PL提出一种改进的并发控制模型。在该模型中,引入优先级分配机制和加锁检测机制。通过这两种机制可更好地协调DRTDBS中一致性与截止期的关系,同时也解决了DHP-2PL中事务高重启率的问题。Some concurrency control models used for RTDBS were introduced, and how to use them on the ...
薛永生, 翁伟, 王劲波, 吕晓华
core  

Bias Reduction in Robust Mean–Geometric Mean Linking via SIMEX

Algorithms
Robust mean–geometric mean (MGM) linking is a method for comparing the performance of two groups on a test involving dichotomous items and is particularly suited to settings with fixed and sparse differential item functioning (DIF).
Alexander Robitzsch
doaj   +1 more source

Limits on Log Odds Ratios for Unidimensional Item Response Theory Models

Rasch model, 2PL model, normal ogive model, cumulant generating function,
Shelby Haberman, Paul Holland, Sandip Sinharay   +2 more
core   +1 more source

Linking Error Estimation in Haberman Linking

AppliedMath
Haberman linking is a widely used method for comparing groups using the two-parameter logistic item response model. However, the traditional Haberman linking approach relies on joint item parameter estimation, which prevents the application of standard M-
Alexander Robitzsch
doaj   +1 more source

Modified Bayesian Information Criterion for Item Response Models in Planned Missingness Test Designs

Analytics
The Bayesian information criterion (BIC) is a widely used statistical tool originally derived for fully observed data. The BIC formula includes the sample size and the number of estimated parameters in the penalty term.
Alexander Robitzsch
doaj   +1 more source

Επέκταση και χρήση των υβριδικών μοντέλων λανθανουσών μεταβλητών σε δεδομένα με ελλιπείς παρατηρήσεις και για την εύρεση σημείων επιρροής

, 2014
The term Hybrid is used in general to describe the mixed character of something having two kinds of components. Hybrid latent variable models allow the specification of two or more classes and withinclass structures that can range from local independence
Τσομπανάκη, Ευγενία, Tsompanaki, Evgenia   +1 more
core   +1 more source

Reporting of Subscores Using Multidimensional Item Response Theory

2PL model, Mean squared error, augmented subscore,
Shelby Haberman, Sandip Sinharay
core   +1 more source

On the Unidentifiability of the Fixed-Effects 3PL Model

, 2014
The paper offers a general review of the basic concepts of both statistical model and parameter identification, and revisits the conceptual relationships between parameter identification and both parameter interpretability and properties of parameter ...
San Martin Gutiérrez, Ernesto, González, Jorge, Tuerlinckx, Francis   +2 more
core   +1 more source