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    Help with power calculation!?




    Hi, I have a dataset on a cohort of patients with fixed number of subjects. I have a primary outcome and a primary exposure. If I want to do a statistical analysis on this cohort, prior to that how could I calculate the power of my study? From the cohort I know the prevalence of the outcome. Could someone lead me to the right web-link
    Thanks

    sample size 28350
    Of the whole population 10.4% have the outcome, 89.6% don't.
    Of those with the main exposure, 12% have the outcome of those without the main exposure 10%.

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    Re: Help with power calculation!?

    hi,
    I think this is a bit too vague. The power relates to a particular test, so the first step should be to decide which test(s) are you interested in. After that you can either search for the power of that particular test - and there a lots of goof resources on the net- or just ask the question here.

    regards
    rogojel

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    Re: Help with power calculation!?

    You are probably thinking about running a Z-test to compare the "outcome" proportions in the two "exposure" groups, correct?

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    Re: Help with power calculation!?

    Quote Originally Posted by staassis View Post
    You are probably thinking about running a Z-test to compare the "outcome" proportions in the two "exposure" groups, correct?
    Hi staassis and rogojel. Thanks for reply. Yes Z test is fine. Would you be able to send me a link? thanks

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    Re: Help with power calculation!?


    hi,
    this is one: http://www.statisticalsolutions.net/pss_calc.php

    regards
    rogojel

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