Description
Return parentAge-childAge and its residual against branch duration, plus consistentOrder for parent at least child.
Evolutionary time and branch length are linked through a supplied clock or calibration. A unit conversion, path sum or residual assumes the underlying tree and rate model rather than recovering them from biological data.
Return parentAge-childAge and its residual against branch duration, plus consistentOrder for parent at least child.
When to use this tool
Use Phylogenetic Node Age Branch Residual when you need one branch-time, path or calibration term.
How to use the tool and how it works
- Enter parentAge, childAge, branchDuration. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read impliedDuration, residual, consistentOrder. Inspect consistentOrder before interpreting the associated values.
Require nonnegative node ages/branch duration. Return parentAge-childAge and its residual against branch duration, plus consistentOrder for parent at least child.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| parentAge | Parent Age | Required. Finite number; minimum 0. |
| childAge | Child Age | Required. Finite number; minimum 0. |
| branchDuration | Branch Duration | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| impliedDuration | Implied Duration | Required. Finite number. |
| residual | Residual | Required. Finite number. |
| consistentOrder | Consistent Order | Required. Boolean. |
{
"input": {
"parentAge": 12,
"childAge": 5,
"branchDuration": 6
},
"output": {
"impliedDuration": 7,
"residual": 1,
"consistentOrder": true
}
}Limitations and assumptions
- A negative implied duration is returned with false, rather than automatically rejected. Ages share a before-present reference and actual topology/calibration are not validated.
- 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 a complete phylogenetic or dating method with the relevant sequence, fossil and rate evidence. Verify topology, branch units, calibration assumptions and uncertainty separately.
References
Similar or alternative tools
- Phylogenetic Tip Date Root Distance Gap
Multiply elapsed years by rate and subtract from observed root distance.
- Fossil Calibration Interval Width Term
Return width, inclusive membership and min(node-min,max-node) as signed nearestBoundGap.