Table 6.
Variables Representing Counts of Gene Occurrences
| No. of libraries | Gene A present | Gene A absent | Total |
| Gene B present | n11 | n12 | n1. |
| Gene B absent | n21 | n22 | n2. |
| Total | n.1 | n.2 | n.. |
Variables Representing Counts of Gene Occurrences
| No. of libraries | Gene A present | Gene A absent | Total |
| Gene B present | n11 | n12 | n1. |
| Gene B absent | n21 | n22 | n2. |
| Total | n.1 | n.2 | n.. |