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Thread: help calculating needed sample size

  1. #1
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    help calculating needed sample size

    hi im conducting a study on a certain ratio in a blood exam (lets call it X) .

    I aim to say that there is a certain sensitivity (let say>80%) for people to be sick if X>10. (my actual intent is to check the sensitivity for different values of X)

    its a retrospective cohort and the estimated incidence of sick people in the whole group is 3.5%

    how or which tool should i use to calculate the sample size? i have tried to find an answer online (including this good chinese site: http://www.statstodo.com/StatsToDoIndex.php#Sample Size) but so far no success

    thanks so much for your help!

  2. #2
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    Re: help calculating needed sample size

    I think this article might have the answer you need: http://www.ncbi.nlm.nih.gov/pubmed/7063747

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