help effectsize
--------------------------------------------------------------------------------------------------------------------------------------------

Title

    effectsize --
                   Computes effect size after anova.


Syntax

        effectsize term


    options                  description
    --------------------------------------------------------------------------------------------------------------------------------------
    Required
      term                   Anova term being tested

    --------------------------------------------------------------------------------------------------------------------------------------

Description

    effectsize computes effects size after anova.  The output includes omega2, eta2, Cohen's f, partial omega2, and partial eta2.

Remarks

    Eta2 is interpreted as percent of dv accounted for by the effect in the sample.  While omega2 is interpreted as percent of dv
    accounted for by the effect in the population.

    Rough guidelines for effect size:
    omega2 and eta2: .01 small; .06 medium; .14 large
    Cohen's f:       .10 small; .25 medium; .40 large

    Of course, these are only very rough guidelines.


Examples

    . anova write prog female prog*female
    . effectsize prog
    . effectsize prog*female

References
    (1995) Kirk, R.E. Experimental design: Procedures for the behavioral sciences (3rd ed). Pacific Grove, CA: Brooks/Cole.
    (2008) SAS 9.2 Documentation for GLM. Cary, NC: SAS Institute Inc.
  

Author

    Philip B. Ender
    UCLA Statistical Consulting Group
    ender@ucla.edu