Description
New-rate fraction=(nextStart-effective)/(nextStart-start); blended rate weights oldRate before effectiveDay and newRate from effectiveDay to the excluded season end.
Policy-related period and quantity calculations need explicit expiry boundaries, claim-season anchors and moisture conventions. Half-open periods differ from inclusive day counts, and moisture-standardized mass differs from observed wet mass. Supplied rules and reference values do not establish current policy.
New-rate fraction=(nextStart-effective)/(nextStart-start); blended rate weights oldRate before effectiveDay and newRate from effectiveDay to the excluded season end.
When to use this tool
Use Policy Rate Phase In Fraction when checking the stated caller-defined policy time, proration or material-basis convention.
How to use the tool and how it works
- Enter claimSeasonStart, nextClaimSeasonStart, effectiveDay, oldRate, newRate. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read newRateFraction, blendedRate. Use the output convention below.
Require whole day anchors with nextClaimSeasonStart>claimSeasonStart and effectiveDay within their closed bounds. New-rate fraction=(nextStart-effective)/(nextStart-start); blended rate weights oldRate before effectiveDay and newRate from effectiveDay to the excluded season end. The shared proration calculation accepts effectiveDay at either endpoint.1
The general policy-rate proration calculation is reused with claim-season anchors as its interval endpoints. It weights old and new rates by the duration on each side of effectiveDay and treats the final interval boundary as excluded.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| claimSeasonStart | Claim Season Start | Required. Safe integer. |
| nextClaimSeasonStart | Next Claim Season Start | Required. Safe integer. |
| effectiveDay | Whole boundary where the new rate begins; either season endpoint is accepted. | Required. Safe integer. |
| oldRate | Old Rate | Required. Finite number. |
| newRate | New Rate | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| newRateFraction | Share of half-open season at the new rate: (nextStart-effective)/(nextStart-start). | Required. Finite number. |
| blendedRate | Blended Rate | Required. Finite number. |
{
"input": {
"claimSeasonStart": 0,
"nextClaimSeasonStart": 360,
"effectiveDay": 90,
"oldRate": 0.1,
"newRate": 0.2
},
"output": {
"newRateFraction": 0.75,
"blendedRate": 0.175
}
}Limitations and assumptions
- Season boundaries are supplied rather than inferred from a year or statute; this is arithmetic proration rather than a determination of applicable policy.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified dates, quantities and authoritative current program or contract documents for real administrative and financial decisions.
References
Similar or alternative tools
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