Glossary
net_roi_ratio and return_on_spend_ratio
The two named return ratios One3 uses instead of a bare "ROI" — break-even 0.0 and 1.0.
One3 never uses the word "ROI" alone as a label, column or threshold. Two common ratios differ by exactly 1.0, and mixing them up turns break-even into an apparent 100% return.
net_roi_ratio= (measured_return − investment) / investment. Break-even 0.0.return_on_spend_ratio= measured_return / investment. Break-even 1.0.
So 100 invested and 100 returned gives return_on_spend_ratio 1.0 and net_roi_ratio 0.0. Guards are named to match: min_net_roi_ratio breaks even at 0.0; min_return_on_spend_ratio at 1.0. Only incremental_net_roi_ratio, computed from a final experiment, may be called financial ROI.
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