funnel plot for odds ratio

Discussion in 'SPSS' started by Felix, Oct 25, 2011.

  1. Felix

    Felix Guest

    Dear all, I am a bit stuck with interpreting a funnel plot using odds
    ratios as the effect size. I plotted as recommended e.g. by the
    Cochrane Meta-Analysis Methods Group log OR against the standard
    error. However, the SE correlates with the effect size and should see
    some asymmetry even in the absence of publication bias. Are there any
    rules to assess such funnel plots? Many thanks in advance. Felix
    Felix, Oct 25, 2011
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