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Tools for estimating power
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Commercial tools
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PASS
(www.ncss.com)
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Matlab (sampsizepwr in statistics toolbox)
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Free software
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http://dceg.cancer.gov/tools/design/POWER•
http://biostat.mc.vanderbilt.edu/wiki/Main/PowerSampleSize
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Online tools
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http://www.dssresearch.com/KnowledgeCenter/toolkitcalculators/statisticalpowercalculators.aspx