Description
Crosswalk compatible set Dice and Jaccard scalar scores using their exact algebraic relation, preserving which score is the target.
A similarity term depends on the comparison universe, missing-value policy, treatment of repeated features, and normalization. A score can also have a caller-selected value when its mathematical denominator vanishes. Those conventions matter before interpreting a threshold or comparing methods.
Crosswalk compatible set Dice and Jaccard scalar scores using their exact algebraic relation, preserving which score is the target.
When to use this tool
Use Similarity: Dice Jaccard Scalar Crosswalk when you need this particular comparison term, normalization, domain condition, or empty-result policy in a larger matching workflow.
How to use the tool and how it works
- Enter score, source. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Convert Jaccard to Dice by 2*score/(1+score), or Dice to Jaccard by score/(2-score), returning converted and target inside result. Require score within zero through one and a recognized source.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| score | Score | Required. Finite number. |
| source | Source | Required. Text; one of "jaccard", "dice". |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Result | Required. Object. |
{
"input": {
"score": 0.5,
"source": "jaccard"
},
"output": {
"result": {
"converted": 0.6666666666666666,
"target": "dice"
}
}
}Limitations and assumptions
- The relationship assumes both measures describe the same underlying overlap/count convention. It does not reconcile different empty policies, feature weighting, preprocessing, or semantic comparison models.
- Outputs are nested inside result. The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- 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. Signed zero is exported as zero.
Alternative or Complementary methods
Compare methods only after aligning feature definitions, missingness, empty policies, multiplicities, and normalizers. Use a complete comparison when the tool returns only one contribution or count check.
References
Similar or alternative tools
- Dice Overlap Count Contribution
Return exact decimal numerator twice overlap and denominator firstSize+secondSize using BigInt, plus numeric dice.
- similarity/jaccard
Compare two sets using the size of their intersection and union.