https://www.mckinsey.com/business-functions/organization/our... > Gender diversity is correlated with both profitability and value creation. In our 2017 data set, we found a positive correlation between gender diversity on executive teams and both our measures of financial performance: top-quartile companies on executive-level gender diversity worldwide had a 21 percent likelihood of outperforming their fourth-quarti…
> In the original research, using 2014 diversity data, we found that companies in the top quartile for gender diversity on their executive teams were 15 percent more likely to experience above-average profitability than companies in the fourth quartile. In our expanded 2017 data set this number rose to 21 percent and continued to be statistically significant. For ethnic and cultural diversity, the 2014 finding was a…
I agree these study parameters would yield much better data. The construction of such a study would probably prove challenging.