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Power and sample size calculations for longitudinal studies comparing rates of change with a time-varying exposure
Existing study design formulas for longitudinal studies have assumed that the exposure is time-invariant. We derived sample size formulas for studies comparing rates of change by exposure when the exposure varies with time within a subject, focusing on observational studies where this variation is n...
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| Hauptverfasser: | , |
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| Format: | Artigo |
| Sprache: | Inglês |
| Veröffentlicht: |
2010
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| Schlagworte: | |
| Online Zugang: | https://ncbi.nlm.nih.gov/pmc/articles/PMC3772653/ https://ncbi.nlm.nih.gov/pubmed/19899065 https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1002/sim.3772 |
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