Magnitude of effect size, t
Taken from Wellek (2003)
Setting |
Parameter |
Reference Value |
Strict |
Liberal |
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Sign Test |
P(difference>0) |
1/2 |
0.10 |
0.20 |
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Mann Whitney |
P[X>Y] |
1/2 |
0.10 |
0.20 |
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||||||||||||<20% style="VERTICAL-ALIGN: top; TEXT-ALIGN: center"> 2 Binomials ||log $$\frac{p_text{1}(1-p_text{2})}{(1-p_text{1})p_text{2}}$$ || 0 || 0.41 || 0.85 ||
Paired t |
$$\frac{\mbox{Paired difference}}{\mbox{sd(difference)}}$$ |
0 |
0.25 |
0.50 |
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Unpaired t |
$$\frac{\mbox{Group mean difference}}{\mbox{sd(average group sd)}}$$ |
0 |
0.36 |
0.74 |
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