Opinions on: line as a functional unit

[Jorge_Stolfi]

Is it important how the split is made? For example, randomly assigning lines to A or B vs assigning the first half of the lines to A and the second to B.

Either way will have the same chance of detecting spurious "anomalies" due to sampling error alone.  But if the lines are split as ( first half, second half ), any anomaly that is detected in only one half could still be a real anomaly that occurs only there. Which would be an interesting discovery...

All the best, --stolfi