https://webpower.psychstat.org/wiki/ 2026-04-17T05:27:37-0400 https://webpower.psychstat.org/wiki/ https://webpower.psychstat.org/wiki/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/kb/statistical_power_analysis?rev=1726763099&do=diff Statistical power analysis Disclaimer: Most of the contents on this page were directly copied from Wikipedia. The power of a statistical test is the probability that it correctly rejects the null hypothesis when the null hypothesis is false (i.e. the probability of not committing a Type II error). That is,\[ \mbox{power} = \mathbb P\big( \mbox{reject null hypothesis} \big| \mbox{null hypothesis is false} \big) \]\(Y-X\)\((Y-X)/\sigma\)\(\pi\)\(\pi\)\(\beta\)\(\alpha\)\(\beta\)\(\alpha\)\(\beta…