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A COMPARISON METHOD OF EQUATING CLASSIC AND ITEM RESPONSE
THEORY (IRT): A CASE OF IRANIAN STUDY IN THE UNIVERSITY
ENTRANCEEXAM
Ali Moghadamzadeh , Keyvan Salehi , Ebrahim Khodaie
International Conference on Education and Educational Psychology (ICEEPSY 2011)
Procedia - Social and Behavioral Sciences 29 ( 2011 ) 1368 – 1372
Reporter : Yu Chih Lin
Outline
Abstract
Introduction
Methodology
Results
Abstract
Introduce the concept of equating
Compare classic equating and item response theory(IRT)
Advantages
Disadvantages
Different errors of equating
Using software’s BILOG and SPSS
Abstract
In the two tests
Equated with the same scale
Accuracy of equating was estimated
This study has implications for educational measurement and testing procedures
Adaptive testing
Test constructing
Introduction
Equating is a statistical method , called equating of test
Relate two or more tests
Base two or more tests on a same scale
Methods of equating general can be categorized
Horizontal
Vertical
Introduction
Determining that whether tests can be equated
Dependent on the possibility of establishing the equating conditions
Equating the tests four conditions
Similar ability
Equity
Population invariance
symmetry
Methodology
To answer the intended items, the subjects for this population were considered
People were all Iranian
Taking the test in the field of Test of language
By The Iranian measurement organization (TOLIMO)
Methodology
Sample size
sampling error of 0.5 %
confidence level of 95 %
for form A
1054 participants
for form B
1241 participants
Methodology
This test is based on three
Sub-scales of vocabulary
Structure
Listening
In this test eight questions were selected as anchor questions
According grades of the forms of A and B
Results
Table 1: Deceptive statistics
Table 2: Summary of Results
Results
Classic method has a little equating between the forms of A and B
Determining the constants, it is not needed to regard symmetry
Generally very difficult to be established in the classic method
Showed the regression indexes were influenced
Respectively the forms of A and B were the references
Results
Results showed that in the classic method
Equating is dependent to the observed sample
IRT can resolve two limits of classic method, symmetry and invariance
In IRT if the model be fitted with the data, parameters of ability can be measured
Results
In the form of A
difficulty ()
discrimination ()
In the form of B
difficulty ()
discrimination ()
Results
In addition, with IRT the parameter of ability (TETA)
Showed that the parameter of discrimination and difficulty
In different mentioned states were not significantly different
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