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Paul Rock Krech, MSW Richard Rivera, BA

The IEA Civics Education Study : Assessing for DIF between two English-speaking Countries using a complex sample design. Paul Rock Krech, MSW Richard Rivera, BA. Items. 38 Multiple Choice Items: dichotomously Scored 0 = Incorrect answer 1 = Correct answer. Sampling design.

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Paul Rock Krech, MSW Richard Rivera, BA

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  1. The IEA Civics Education Study: Assessing for DIF between two English-speaking Countries using a complex sample design. Paul Rock Krech, MSW Richard Rivera, BA

  2. Items • 38 Multiple Choice Items: dichotomously Scored • 0 = Incorrect answer • 1 = Correct answer

  3. Sampling design • IEA Civic Education (CivEd) study used a two-stage stratified cluster approach to sample students. • The schools were sampled in the first stage and • classrooms were sampled in the second stage (Sibberns & Foy, 2004a).

  4. Why stratification? • Improve efficiency of sample design making estimates more reliable. • To apply different sample designs (i.e. disproportionate sample size) to different groups of schools. • To ensure adequate representation in the sample of specific groups from the population.

  5. Stages of Sampling • Creating stratification variables to determine the sampling frame. • One classroom (or homeroom) was drawn from each sampled school for a targeted grade (e.g., 8th, 9th, or 10th). Grades were targeted that typically had 14-year-old students.

  6. Complex sampling variables • A weight variable (TOTWGT), across participants is an estimate of the population size. • (HOUSEWGT) is equal to the raw weight divided by its mean; and across students is equivalent to the sample size. • (SCHOOLID) is the cluster variable.

  7. Stage Number Weight variable Stage 2: Cluster House Weight IDSCHOOL Stage 1: Strata School 1 Sampled Country Students: 14.0-14.11 YO School 2 IDSTUDENT IDCOUNTRY . . . schoolj Intact Classrooms IDCLASS Other schools (Could also be regions)

  8. Item example 1 Domain I (Democracy), Sub-domain B (Institutions & Practices in Democracy). Bs223 ELECTION LEAFLET HAS BEEN ISSUED BY

  9. Item example 2: (Domain III: Social Cohesion and diversity). BS107Z HAVING MANY POLITICAL AND SOCIAL ORGANIZATIONS TO JOIN IS IMPORTANT IN A DEMOCRACY BECAUSE: 1 They defend members who are arrested. 2 They are sources of taxes for the government. 3 They allow citizens to express different points of view. 4 They provide a way to tell citizens about new laws.

  10. EFA results: Approx. 5 factors

  11. Goodness of Fit Summary

  12. Two group baseline model c2SB(54) = 198.2151, p < .0001 AIC = 183.50 NNFI = 0.95 CFI = 0.96 RMSEA = 0.03

  13. Mantel-Haenszel Chi-Square Estimates Scores Right Wrong _________________ US a b nUS _________________ ENG c d nENG _________________ Total n n nTOT

  14. MH and IRT results (9-items)

  15. DIF on Item BS231z: WHICH IS AN OPINION? 1 Actions – businesses solve environmental problems. 2 Businesses contribute to the pollution. 3 Businesses co-operate to diminish acid rain. 4 Businesses add to water pollution from different sources. Chi-Square Results Focal Group = ENG Reference Group = USA F-statistic p < F ChiSq p < ChiSq N Wgt N 8.811 0.003 8.811 0.003 3011 579910

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