Group Size and Measures of Group-Level Properties: An Examination of Eta-Squared and ICC Values
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1998
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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None
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-370-388
(Last edited on
2002/02/27 18:45:16 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
The eta-squared ( 2 ) from a one-way random effects ANOVA is an index commonly used to estimate group-level properties of data in multilevel research. Under some circumstances, however, 2 values provide biased estimates of the group-level properties. Biased estimates occur because the magnitude of the 2 in a one-way random effects ANOVA is partially a function of group size. In this paper, the relationship between group size and 2 is described, and a simulation verifying the relationship between group size and 2 is conducted. The simulation demonstrates the conditions under which 2 does and does not provide a biased estimate of group-level properties. The paper concludes by (a) discussing corrections for 2 and (b) providing guidelines for calculating estimates of group-level properties in samples having unequal group sizes.
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STATISTICS
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