The Unseen Power Loss : Stemming The Flow  

Oleh:

Gillett, Raphael

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 62 no. 6 (2002), page 960-968.
Topik: power; studies; psychology
Fulltext: 960.pdf (90.54KB)

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: EE30.8 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

The widespread practice of substituting an empirical estimate of effect size int he standard sample size formula causes th eaverage power of studies to fall below the nominal level, often by a considerable margin. Ordinarily concealed from view in an individual experiement, the power loss becomes visibles when studies are examines collectively. To help researchers avoid the power deficit, the expected - power method of sample size determination is described. When information form an earlier study is available, it is recommended that researchers should base sample size calculations on the expected - power formula instead of the traditional power formula.

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