A Cross-National Comparison of Intra-Class Correlation Coefficient in Educational Achievement Outcomes
Abstract
The plausible range of intra-class correlation coefficient (ICC) is essential for both a priori sample size
calculations in planning cluster-randomized trials and statistical adjustments of misaligned analysis of clustered
data in meta-analytic studies. Recent efforts to create databases for ICC in educational achievement outcomes are
based on the studies published only in the US and Europe. The current study aims to extend the existing
information for the plausible range of ICC values in educational achievement outcomes to a global scale by
examining the distributional characteristics of two-level unconditional ICC estimates across countries
participating in two international studies, TIMSS and PIRLS. The findings suggest large variability in the
unconditional ICC estimates across countries, and current standards do not apply to every country. Researchers
should look for country-specific ICC estimates in planning cluster-randomized trials and in comparing studies
across countries
A Cross-National Comparison of Intra-Class Correlation Coefficient in Educational Achievement Outcomes
Abstract
Kumeler-arasi (intra-class) korelasyon (KAK) katsayisinin olasi deger araliginin bilinmesi bireyler yerine
kumelerin rastgele secilerek yapildigi arastirmalarda yeterli istatistiksel gucu elde etmek icin gerekli orneklem
buyuklugunun arastirma oncesi hesaplamasinda kritik bir oneme sahiptir. Ayrica, meta-analitik calismalarda
daha once yayinlanmis arastirmalarin verileri yorumlanirken, eger onceki arastirmalar hiyerarsik bir yapiya sahip
veriyi dogrusal regresyona analizi ile analiz etmislerse, bu arastirmalarin sonuclarinin da istatistiksel olarak
duzeltilmesi gerekmektedir. Bu duzeltme isleminde de, KAK katsayisinin tahmini deger araliginin bilinmesi
gerekli olabilmektedir. Son zamanlarda, egitimde basariyi olcen test skorlari icin KAK katsayisinin tahmini
deger araligini gosteren veri tabanlari olusturma cabalari sadece ABD ve baz i Avrupa ulkeleri ile sinirli
kalmistir. Bu arastirma halihazirda egitimde basariyi olcen test skorlari icin KAK katsayisinin tahmini deger
araligi hakkindaki bilgiyi kuresel olcekte genisletmeyi amaclamis, ve bu amacla iki uluslarasi calismanin,
TIMSS ve PIRLS, verilerini kullanmistir. Arastirmani bulgulari KAK katsayisinin ulkeler arasinda onemli
olcude degisebildigini gostermistir.
Details
| Primary Language | English |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | March 1, 2012 |
| Published in Issue | Year 2012 Volume: 3 Issue: 1 |