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Using e-mail recruitment and an online questionnaire to establish effect size: A worked example
BACKGROUND: Sample size calculations require effect size estimations. Sometimes, effect size estimations and standard deviation may not be readily available, particularly if efficacy is unknown because the intervention is new or developing, or the trial targets a new population. In such cases, one w...
| Autores principales: | , , , |
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
| Publicado: |
BioMed Central
2011
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| Materias: | |
| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3130700/ https://www.ncbi.nlm.nih.gov/pubmed/21658219 http://dx.doi.org/10.1186/1471-2288-11-89 |