All biomarkers showed moderate to strong pairwise correlations across visits.

But machine learning is not just pairwise correlations, of course, any more than the brain is just one neuron.

Billions of dollars have been spent trying to discover pairwise correlations between individual genes and specific diseases, but the yield has been disappointingly low.

Drugs targeting the same pathway shared similar response profiles and multiple pairwise correlations of the chemogenomic profiles revealed novel insights into drugs' mechanisms of action.