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Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 1 Key parameters from the Rasch analyses

From: DIF as a pedagogical tool: analysis of item characteristics in ICILS to understand what students are struggling with

 

# of items

# of cases

Deviance

EAP-reliability

# ICILS DIF

# DIF B

# DIF C

International

62

8000

298,222.10

0.90

   

Norway

62

7500 + 500

297,839.48

0.90

9

6

14

Germany

61

7500 + 500

297,838.64

0.90

7

6

14

Denmark

62

7500 + 500

297,659.42

0.90

9

9

18

  1. Number of cases is 8000 in all analyses. In the DIF-analyses 500 students from the country under investigation and 7500 students from other countries are included
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