The denominator for Cohen's d
| 1 | psd(n1, n2, vr1, vr2)
 | 
| n1 | The sample size for group 1 | 
| n2 | The sample size for group 2 | 
| vr1 | The variance for group 1 | 
| vr2 | The variance for group 2 | 
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