A Study of The Distribution of Sample Coefficient Alpha With The Hopkins Symptom Checklist : Bootstrap Versus Asymptotics  

Oleh:

Guarnaccia, Charles A. ; Ke-Hai, Yuan ; Hayslip, Bert, (Jr.)

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 63 no. 1 (2003), page 5-23.
Topik: SYMPTOMS; reliability; cronbach's alpha; asymptotic distribution; multivariate kurtosis; quantile - quantile plot
Fulltext: 5.pdf (175.81KB)

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE30.9 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Sample coefficient alpha is commonly reported for psychological measurement scales. However, how to characterize the distributin of sample coeffficient alpha with the likert - type scales typically used in social and behavioural science research is not clear. Using the hopkins symptom checklist, the authors compare three characteriztions of the distribution of the sample coefficient alpha, the existing normal - theory - based distribution, a newly proposed distribution based on fourth - order moments, and the bootstrap empirical distribution. Their study indicates that the normal - theory - based distribution has a systematic bias in describing the behaviour of the sample coefficient alpha. The distribution based on fourth - order moments is better than the normal - theory - based distribution has a systematic bias in describing the behaviour of the sample coefficient alpha. The distribution based on fourth - order moments is better than the normal - theory - based one but is still not good enough with finite samples. The bootstrap automatically takes the sampling distribution and sample size into account, thus it is recommended for characterizing the behaviour of sample coefficient alpha with likert - type scales.

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