Description
linkFactor = oldAnchor/newAnchor; linkedObservation = newObservation*linkFactor.
Historical price series need compatible quantities, quality, dates and currency conventions. Rebasing or splicing a series changes its numerical scale without resolving source comparability or proving a change in living standards.
linkFactor = oldAnchor/newAnchor; linkedObservation = newObservation*linkFactor.
When to use this tool
Use Economic History Series Splice Anchor when checking a supplied historical price or index transformation.
How to use the tool and how it works
- Enter oldAnchor, newAnchor, newObservation. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read linkFactor, linkedObservation. Use the output convention below.
Require positive oldAnchor and newAnchor. linkFactor = oldAnchor/newAnchor; linkedObservation = newObservation*linkFactor.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| oldAnchor | Old Anchor | Required. Finite number; strictly above 0. |
| newAnchor | New Anchor | Required. Finite number; strictly above 0. |
| newObservation | New Observation | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| linkFactor | Link Factor | Required. Finite number. |
| linkedObservation | Linked Observation | Required. Finite number. |
{
"input": {
"oldAnchor": 80,
"newAnchor": 100,
"newObservation": 120
},
"output": {
"linkFactor": 0.8,
"linkedObservation": 96
}
}Limitations and assumptions
- Anchors must describe a justified overlap and compatible series concepts. A multiplicative splice does not remove quality changes, basket differences or structural breaks.
- 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
Verify the original quotation basis and comparable series concepts, and use appropriate historical evidence for quality and unit adjustments.
References
Similar or alternative tools
- Price Series Chain Link Term
linkedIndex = previousIndex*(linkPrice/priorPrice).
- Historic Commodity Freight Price Share
landedPrice is their sum; freightShare = freight/landedPrice.