Is anyone familiar with this good introduction to power and sample size article?

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Brijesh Sathian

Good Work. You can also read the below article

http://www.nepjol.info/index.php/NJE/article/view/4100

Jason Leung

Also see about common mistakes involving power

http://www.ma.utexas.edu/users/mks/statmistakes/PowerMistakes.html

It highlights many keypoints and clarifies retrospective power and prospective power