A PostgreSQL/R Architecture for a Cognitive Assessment System E ...

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28 Νοε 2012 (πριν από 4 χρόνια και 25 μέρες)

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A PostgreSQL/R Architecture for a Cognitive Assessment System
E.James Harner (Department of Statistics,West Virginia University)
jharner@student.stat.wvu.edu
Jun Tan,Hengyi Xue,and Lingyi Zheng
Abstract
The Department of Statistics has been developing the infrastructure
for an Intelligent Distributed Environment for Adaptive Learning (IDEAL;
http://ideal.stat.wvu.edu) to teach introductory statistics and alge-
bra courses.An advanced cognitive assessment system is being built for
IDEAL that derives from Tatsuoka's Q-matrix theory,i.e.,cognitive skills
will be associated with a large number of questions which the student
must answer during the semester.Hierarchical Bayesian models for doing
formative assessment will be built on Junker's DINA and NIDA conjunc-
tive discrete cognitive-attribute models for task performance.Student
scores will be stored in a PostgreSQL database.The assessment models
will be built using R,which will be embedded within PostgreSQL.Cog-
nitive assessment update requests to PostgreSQL will be passed to R for
processing and the results will be returned to the database for student
and instructor Web-based access.