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Power Calculator Links

Statistical power calculators allow you to input your own values and compare different sampling designs by altering the sample size, desired level of statistical power, or the effect size you wish to detect. You enter the data and the browser return values for different combinations of parameters.

http://socr.ucla.edu/htmls/SOCR_Analyses.html/

http://www.stat.uiowa.edu/~rlenth/Power/

http://www.quantitativeskills.com/sisa/

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