Compute Effect Sizes

Several functions are available for calculating the most widely used effect sizes (ES), along with their variances, confidence intervals and p-values. The output includes ES's of d (mean difference), g (unbiased estimate of d), r (correlation coefficient), z' (Fisher's z), and OR (odds ratio and log odds ratio). In addition, NNT (number needed to treat), U3, CLES (Common Language Effect Size) and Cliff's Delta are computed. This package uses recommended formulas as described in The Handbook of Research Synthesis and Meta-Analysis (Cooper, Hedges, & Valentine, 2009).


============================================================================== Changes in 0.2-4 (09-16-2014)

Minor changes

o Changed calculation of NNT to Furukawa and Leucht's (2011) procedure.

o Added cer and verbose arguments (see documentation for details).

o Changed documentation accordingly.

============================================================================== Changes in 0.2-3 (01-17-2014)

Minor changes

o Fixed bug that did not allow output to be saved as object for single value

o Added simple examples for running functions in the documentation.

o Minor clarifications to function arguments based on user feedback

============================================================================== Changes in 0.2-2 (10-18-2013)

Major changes

o Effect sizes can now be calculated from both scalar values 
  and vector data.

o Functions will now output confidence intervals, and p-values,
  along with NNT (number needed to treat), U3 (Cohen's U_3 distribution
  overlap statistic), CLES (Common Language Effect Size) and
  Cliff's Delta (success rate difference).

Minor changes

o More user friendly output than previous versions

o Documentation changed accordingly.

============================================================================== First version in R CRAN 0.1

Reference manual

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0.2-5 by AC Del Re, 2 years ago

Browse source code at

Authors: AC Del Re

Documentation:   PDF Manual  

Task views: Meta-Analysis

GPL-2 license

Suggested by RcmdrPlugin.MA, bayesmeta.

Enhanced by MAc, MAd.

See at CRAN