GUIDES · BETSLIP DOCTOR
Why is ROI missing on a Tail record with no recorded stake risk?
Tail calculates ROI as net units divided by risk units. When recorded risk is zero, the result model sets ROI to null instead of manufacturing a percentage. The profile summary omits the ROI value when it is null; that does not mean the record has zero performance, a loss or a missing personal sportsbook balance.
For BSD readers checking an absent ROI value on a Tail record summary · Updated
Without a risk denominator, ROI is undefined
The Tail record computes ROI only when risk is greater than zero. With zero recorded risk, it stores null. Dividing by zero cannot produce a meaningful percentage, so the record does not substitute 0% for an unavailable calculation.
The profile summary renders ROI only when the value is present. That is why a record with zero recorded stake risk can show no ROI percentage even though it still has other record fields.
- Read a missing ROI as unavailable for that denominator.
- Do not translate null into a measured 0% ROI.
- Check net units and risk separately if both are shown.
Missing ROI does not diagnose performance or an account balance
A null ROI value says the record has no positive risk denominator for that summary. By itself, it does not prove that money was lost, performance was zero, the system is broken or a personal sportsbook balance is missing.
Keep the explanation tied to the Tail record's risk and units for the selected period. The calculation describes stored record data and makes no claim about an external account.
Illustrative example: no percentage without recorded risk
Imagine a fictional Tail summary whose selected period has zero recorded stake risk. The summary has no ROI percentage because the denominator is unavailable; it does not replace that value with 0%. A reader checks the period's other displayed fields without inferring a loss or a personal cash balance. No actual record or performance is represented.
Related questions
Is missing ROI the same as 0% ROI?
No. Tail stores ROI as null when risk is zero. A measured 0% ratio and an unavailable denominator are different states.
Does missing ROI mean the capper lost money?
No. Missing ROI alone does not establish a loss, zero performance or a personal sportsbook balance. It means the record has no usable risk denominator for that calculation.