Group Overlap as A Basis for Effect Size  

Oleh:

Lowman, Laureen L. ; Huberty, Carl J.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 60 no. 4 (2000), page 543-563.
Topik: effect; psychological tests; statistics; comparative analysis
Fulltext: 543.pdf (145.09KB)

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE30.5 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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The research content of interest herein is that of comparison of means. It is generally recognized that statistical type p values do not adequately reflect mean comparison assessments, What is desirable is some effect - size assesment, The typical effect - size indexes used in mean comparison sare restricted to the variance homogeneity condition. What is proposed here is the use of the group - overlap concept. Group overlap may be assessed via production of group assignment, that is, using predictive discriminant analysis. The effect - size index proposed is that of improvement - over - chance classification (I). The I index may be used in situations that are univariate, multivariate, homogeneous, heterogeneous, or any combination thereof. Some very tentative suggestions for cutoffs of I values to decline index magnitude for some data situations are made.

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