https://webpower.psychstat.org/wiki/ 2026-05-07T01:11:02-0400 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/blog?rev=1726763099&do=diff text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/bookstore?rev=1726763099&do=diff text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/effectsize?rev=1726763099&do=diff Effect size calculation Given the ample interest of calculating effect sizes, WebPower is in the process of developing routines to calculate effect sizes online for a variety of methods including t-test, ANOVA, regression, mediation analysis, moderation analysis, structural equation modeling and multilevel modeling. When it is possible, confidence intervals of effect sizes will also be provided. text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/privacy?rev=1726763099&do=diff Privacy Policy Zhiyong Zhang built the WebPower app as a Free app. This SERVICE is provided by Zhiyong Zhang at no cost and is intended for use as is. This page is used to inform website visitors regarding my policies with the collection, use, and disclosure of Personal Information if anyone decided to use my Service. text/html 2025-12-12T20:38:00-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/service?rev=1765589880&do=diff Statistical Consulting Service The WebPower development team provides consulting services, including statistical software support and assistance with experimental design and analysis to the research community. We provides assistance with experimental design and data analysis for all phases of research projects, including but not limited to: text/html 2024-10-24T13:26:41-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/sidebar?rev=1729790801&do=diff Navigation * WebPower * Ask Power * My Analyses * New Power Analysis * Consulting service * Effect Size * Manual * FAQ * Research Team * What's new * Tools * Workshop * References text/html 2026-01-17T17:36:13-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/start?rev=1768689373&do=diff Statistical Power Analysis Online WebPower is a collection of tools for conducting statistical power analysis online. WebPower can be used by anyone for free. To use the software now, click here. For a short tutorial on how to use WebPower, click here. For the online manual book (more than 30MB), please text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/test?rev=1726763099&do=diff This is a simple test Parameters Sample size Effect size Significance level text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/url?rev=1726763099&do=diff WebPower.psychstat.org text/html 2024-09-19T12:24:59-0400 Anonymous (anonymous@undisclosed.example.com) https://webpower.psychstat.org/wiki/version_history?rev=1726763099&do=diff History of Version 2014/5/1 Power analysis for means