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Statistical power as a function of Cronbach alpha of instrument questionnaire items
BACKGROUND: In countless number of clinical trials, measurements of outcomes rely on instrument questionnaire items which however often suffer measurement error problems which in turn affect statistical power of study designs. The Cronbach alpha or coefficient alpha, here denoted by C(α), can be use...
| Autores principales: | , , |
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
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BioMed Central
2015
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| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4606843/ https://www.ncbi.nlm.nih.gov/pubmed/26467219 http://dx.doi.org/10.1186/s12874-015-0070-6 |