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    Sample size calculation

    I need to study the outcome of an intervention in a disease. I will be doing a prospective observational (longitudinal) study in a single cohort (I am not sure if i'm correct - I mean, I will be taking only a single group of diseased undergoing the proposed intervention). The prevalence of the...
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    Sample size calculation for prospective observational study studying outcome of an intervention?

    Hello everyone, I am submitting proposal for thesis and I need help with the sample size calculation. My study is: to study the outcome of "x" intervention in "y" disease The prevalence of disease is 2.6%. How do I calculate the needed sample size? What else information do I need from the...