Links

Information about effect size (standardized mean difference):

 

Wikipedia’s overview of effect size is readable and informative:

http://en.wikipedia.org/wiki/Effect_size

 

Overview and calculator by Lee Becker of the University of Colorado at Colorado Springs (UCCS)

http://www.uccs.edu/~faculty/lbecker/es.htm

http://www.uccs.edu/~faculty/lbecker/

 

Thalheimer, W., & Cook, S. (2002, August). How to calculate effect sizes from published research articles: A simplified methodology.

http://www.work-learning.com/white_papers/effect_sizes/Effect_Sizes_pdf5.pdf

 

Other effect size calculators and graphing software:

 

Effect Size Calculator

http://www.uccs.edu/~faculty/lbecker/

 

Centre for Evaluation & Monitoring Effect Size Calculator and Graphing tool

http://www.pipsproject.org/renderpage.asp?linkID=30325017

 

Bolder Stats Cohen’s d and Distribution Overlap applet

http://www.bolderstats.com/jmsl/doc/CohenD.html

 

Claremount Graduate University Web Interface for Statistical Education Statistical Power Applet:

http://www.wise.cgu.edu/power/power_applet.asp

 

Calculators and illustrators for dichotomous measures:

 

Understanding Uncertainty: Spinning the Risk (University of Cambridge)

http://understandinguncertainty.org/node/233

 

Visual Rx - Online NNT Calculator

http://www.nntonline.net/visualrx/

 

Confidence interval calculator for NNTs and much more (by Robert Herbert, University of Sydney)

www.pedro.org.au/wp-content/uploads/CIcalculator.xls

 

Centre for Evidence Based Medicine, University Health Network (Toronto)

http://www.cebm.utoronto.ca/practise/ca/statscal/