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Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 5 Growth parameter estimates

From: An item response theory approach to longitudinal analysis with application to summer setback in preschool language/literacy

   

T Contrast

C Contrast

DIF

Model

Effect

Estimate

SE

Estimate

SE

No DIF Adjustment

1PL

2

1.09

.03

-.48

.04

 

3

.41

.04

.38

.08

  

4

2.26

.03

1.60

.04

 

2PL

2

1.02

.03

-.39

.04

  

3

.47

.04

.37

.08

  

4

2.22

.04

1.57

.06

DIF Adjusted

1PL

2

1.16

.04

-.50

.06

 

3

.45

.04

.50

.08

  

4

2.60

.06

1.84

.08

 

2PL

2

.58

.04

-.33

.06

  

3

.12

.03

.37

.06

  

4

1.43

.07

1.01

.10

  1. Note. All coefficients are significant at α = .001.
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