More Effect Sizes by eYhL5doH

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									Conversions of Effect Sizes
Log Odds and d
  From log odds to d:
                                                          3
                           d  ( LogOddsRat io)
                                                      
                                                     3
                             Vd  (VLogOddsRatio )
                                                     2

  From d to log odds:
                                  
          LogOddsRat io  d
                                   3

                                  2
             VLogOddsRatio  Vd
                                  3
Converting r and d
From r to d            2r                  4Vr
                  d               Vd 
                       1 r2            (1  r 2 ) 3


 From d to r

    r
              d             (n1  n2 ) 2
                         a
          d2 a                n1n2
   If n1 and n2 are unknown, use a = 4.
                     a 2Vd
               Vr  2
                   (d  a)3
Other conversions
 If you want to move from log odds to correlation, go
 through d. Consider whether the results of the
 studies should really be combined or not.

								
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