Cohen's d Calculation
Calculates a Cohen's d effect size using the means and standard deviations of two independent groups
cohens_d(Group1_Mean, Group1_SD, Group2_Mean, Group2_SD)
Group1_Mean |
Mean for Group 1 |
Group1_SD |
Standard Deviation for Group 1 |
Group2_Mean |
Mean for Group 2 |
Group2_SD |
Standard Deviation for Group 2 |
A single value representing the Cohen's d effect size
Mike Malek-Ahmadi
1. Cohen, Jacob (1988). Statistical Power Analysis for the Behavioral Sciences. Routledge. ISBN 978-1-134-74270-7.
2. Malek-Ahmadi M, Perez SE, Chen K, Mufson EJ. Neuritic and diffuse plaque associations with memory in non-cognitively impaired elderly. J Alzheimers Dis 2016;53(4):1641-1652.
#From Table 2 in Malek-Ahmadi et al (2016) #comparing groups with (0.75+/-0.35) and without (0.49+/-0.29) neuritic plaques #on a global cognitive score (z-score). cohens_d(0.75, 0.35, 0.49, 0.29)
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