I would like to estimate the statistical power represented by my sample. And also estimate a sample size according to the prevalence of the disease.
Dear colleague.
A really good question. Some software (mainly newer versions) already have it partially implied. The use of packages in R (https://www.statmethods.net/stats/power.html) is great.
If you want a simple tool, I recommend G*Power - it's software available for free and very easy to use. Given your interest in researching the size of the sample, it will be ideal for you :)
https://gpower.software.informer.com/3.1/
Best regards, Marián
Xochitl Castro, you have not provided nearly enough information about the nature of your study (including the intended analysis) for anyone to give detailed advice. But you mentioned prevalence of disease, which makes me think you might be talking about a 2x2 table. If so, you might find an appropriate calculator here:
- https://www.sealedenvelope.com/power/
HTH.
I agree with Bruce Weaver and would add you need to specify your research design and the nature of your outcome/dependent variable (categorical, continuous, etc), the estimated effect size (as a difference in means, odds ratio, etc.) and your level of statistical significance. In addition to Bruce's suggestion I would recommend
https://www.openepi.com/Menu/OE_Menu.htm
which is a user-friendly table-entry software program with a lot of flexibility for different designs/measures. Good luck.
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