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Effect size in multiple regression

  1. Sep 20, 2012 #1
    Hello,

    I'm using this this calculator to determine a rough sample size for a multiple regression (20 predictors).

    http://www.stattools.net/SSizmreg_Pgm.php

    I don't really understand the effect size?

    Could somebody tell me if you are using multiple regression (with 20 predictors) and you want the regression to have an R2 > 0.8, do you want a small effect size for example 0.2 or a large effect size for example 0.5?

    Basically I want a accurate model, what effect size value should I use?

    Thank you
     
  2. jcsd
  3. Sep 21, 2012 #2

    chiro

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