Fragmentation Index Bone Assemblage

Summarize observed fragment multiplicity on independently refitted elements and retain unrefittable coverage; unidentified pieces do not become inferred elements or breakage histories.

Description

Refitted fragments can establish how many pieces represent each known element.

Refitted fragments can establish how many pieces represent each known element. Unrefittable pieces have a separate coverage denominator.

Summarize observed fragment multiplicity on independently refitted elements and retain unrefittable coverage; unidentified pieces do not become inferred elements or breakage histories.

When to use Fragmentation Index Bone Assemblage

Use this tool to summarize observed fragment multiplicity on independently refitted elements and retain unrefittable coverage; unidentified pieces do not become inferred elements or breakage histories.

Prepare the fossil measurements or occurrence records and the chosen calibration parameters. Retain the stated coordinate, age and measurement conventions.

How to use Fragmentation Index Bone Assemblage and understand its results

Prepare the fossil measurements or occurrence records and the chosen calibration parameters. Retain the stated coordinate, age and measurement conventions.
Enter fragmentCountsPerRefittedElement, unrefittableFragmentCount using the field table and calculation rules, then run the tool.
Read refittedFragmentationRatio, fragmentedRefittedElementFraction, unrefittableFragmentFraction. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
fragmentCountsPerRefittedElement	Fragment counts per refitted element	list of number	Required
unrefittableFragmentCount	Unrefittable fragment count	integer	Required

Use positive integer fragment counts per refitted element and nonnegative unrefittable count. Return mean multiplicity, fraction of elements with more than one piece and unrefittable share of all pieces.^[1]

fragmentation ratio = summed refitted fragments/refitted elements

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
refittedFragmentationRatio	Refitted fragmentation ratio	number
fragmentedRefittedElementFraction	Fragmented refitted element fraction	number
unrefittableFragmentFraction	Unrefittable fragment fraction	number

json

{
  "input": {
    "fragmentCountsPerRefittedElement": [
      1,
      2,
      4
    ],
    "unrefittableFragmentCount": 3
  },
  "output": {
    "refittedFragmentationRatio": 2.3333333333333335,
    "fragmentedRefittedElementFraction": 0.6666666666666666,
    "unrefittableFragmentFraction": 0.3
  }
}

Limitations and assumptions

Unidentified fragments do not become inferred elements or a reconstructed breakage history.

Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use NISP to MNE Conversion: Infer minimum elements as maximum diagnostic landmark multiplicity within caller matched element/side groups, then compare NISP; fragments are not directly divided by a universal conversion factor. For a complementary task, use Tooth Mark to Tool Mark Ratio Checker: Compare caller classified tooth/tool-marked bone prevalence with co-marked overlap retained; observed-bone ratios do not determine predator/human sequence or agents.

References

Fragmentation Index Bone Assemblage — tool.io

Similar or alternative tools

NISP to MNE Conversion
Infer minimum elements as maximum diagnostic landmark multiplicity within caller matched element/side groups, then compare NISP; fragments are not directly divided by a universal conversion factor.
Tooth Mark to Tool Mark Ratio Checker
Compare caller classified tooth/tool-marked bone prevalence with co-marked overlap retained; observed-bone ratios do not determine predator/human sequence or agents.