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Contingency table showing frequency distribution of a categorical covariate in both clusters for any image modality. A symbolizes the presence of a molecular tumor subtype or a driver gene mutation, whereas A′ represents the absence of such a subtype or mutation.
| Cluster 1 | Cluster 2 | Total | |
|---|---|---|---|
| A | y11 | y12 | n1 = y11 + y12 |
| A′ | y21 | y22 | n2 = y21 + y22 |
| Total | y11 + y21 | y12 + y22 | n = n1 + n2 |
