Open AccessLINKING FOR THE GENERAL DIAGNOSTIC MODEL
Author(s) -
Xu Xueli,
Davier Matthias
Publication year - 2008
Publication title -
ets research report series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.235
H-Index - 5
ISSN - 2330-8516
DOI - 10.1002/j.2333-8504.2008.tb02094.x
Subject(s) - item response theory , joint (building) , scale (ratio) , statistics , econometrics , diagnostic test , psychology , mathematics , computer science , psychometrics , medicine , geography , architectural engineering , cartography , engineering , emergency medicine
Three strategies for linking two consecutive assessments are investigated and compared by analyzing reading data for the National Assessment of Educational Progress (NAEP) using the general diagnostic model. These strategies are compared in terms of marginal and joint expectations of skills, joint probabilities of skill patterns, and item parameter estimates. The results indicate that fixing item parameter values at their previously calibrated values is sufficient to establish a comparable scale for the subsequent year.