# DataCite affiliation usage distributions

Category DOI-affiliation pair totals are sums of per-affiliation DOI counts.

An occurrence count is the number of normalized DataCite occurrences for an affiliation. DOI count is the number of distinct DOI-affiliation pairs for an affiliation. The raw affiliation count is the number of pre-normalization affiliation rows represented by an affiliation.

individual DOI prevalence = datacite_doi_count / total_distinct_datacite_dois

Category DOI-affiliation pair totals are not mutually exclusive unique DOI populations.

Distribution percentiles use DuckDB quantile_cont with Type 7 continuous interpolation.

## Category totals and shares

| Category | Affiliations | Affiliation share | Occurrences | Occurrence share | DOI-affiliation pairs | Pair share |
| --- | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1194519 | 0.784955 | 15082454 | 0.0450779 | 9638578 | 0.0861094 |
| overlap | 327249 | 0.215045 | 319503881 | 0.954922 | 102295462 | 0.913891 |

## Occurrence count distribution summaries

| Category | Minimum | Mean | Median | p75 | p90 | p95 | p99 | Maximum |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1 | 12.6264 | 2 | 5 | 12 | 23 | 92 | 649388 |
| overlap | 1 | 976.333 | 4 | 14 | 55 | 161 | 1420.52 | 178348948 |

## DOI count distribution summaries

| Category | Minimum | Mean | Median | p75 | p90 | p95 | p99 | Maximum |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1 | 8.069 | 2 | 3 | 8 | 16 | 65 | 176161 |
| overlap | 1 | 312.592 | 2 | 8 | 33 | 92 | 689 | 41649276 |

## Raw affiliation count distribution summaries

| Category | Minimum | Mean | Median | p75 | p90 | p95 | p99 | Maximum |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1 | 1.06089 | 1 | 1 | 1 | 2 | 2 | 20 |
| overlap | 1 | 1.26594 | 1 | 1 | 2 | 2 | 4 | 46 |

## Full-population concentration

Occurrences and DOI-affiliation pairs are ranked separately. Boundary ties use normalized-affiliation ascending order and do not expand a requested row count.

| Measure | Requested rows | Selected rows | Cumulative count | Population share |
| --- | ---: | ---: | ---: | ---: |
| Occurrences | 1 | 1 | 178348948 | 0.533043 |
| Occurrences | 2 | 2 | 275211083 | 0.822541 |
| Occurrences | 10 | 10 | 285951202 | 0.854641 |
| Occurrences | 100 | 100 | 295095438 | 0.881971 |
| DOI-affiliation pairs | 1 | 1 | 41649276 | 0.372088 |
| DOI-affiliation pairs | 2 | 2 | 83298500 | 0.744175 |
| DOI-affiliation pairs | 10 | 10 | 86039159 | 0.768659 |
| DOI-affiliation pairs | 100 | 100 | 90695652 | 0.81026 |

## No-NIFS sensitivity

This view excludes only DOI prefix `10.57451`; category membership remains based on global Crossref overlap.

| Category | Affiliations | Affiliation share | Occurrences | Occurrence share | DOI-affiliation pairs | Pair share |
| --- | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1194519 | 0.784955 | 15082454 | 0.254682 | 9638578 | 0.338423 |
| overlap | 327248 | 0.215045 | 44138182 | 0.745318 | 18842263 | 0.661577 |

### No-NIFS occurrence count distribution summaries

| Category | Minimum | Mean | Median | p75 | p90 | p95 | p99 | Maximum |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1 | 12.6264 | 2 | 5 | 12 | 23 | 92 | 649388 |
| overlap | 1 | 134.877 | 4 | 14 | 55 | 161 | 1419.53 | 4063817 |

### No-NIFS DOI-affiliation pair count distribution summaries

| Category | Minimum | Mean | Median | p75 | p90 | p95 | p99 | Maximum |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1 | 8.069 | 2 | 3 | 8 | 16 | 65 | 176161 |
| overlap | 1 | 57.5779 | 2 | 8 | 33 | 92 | 689 | 610513 |

### No-NIFS raw affiliation count distribution summaries

| Category | Minimum | Mean | Median | p75 | p90 | p95 | p99 | Maximum |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| datacite_only | 1 | 1.06089 | 1 | 1 | 1 | 2 | 2 | 20 |
| overlap | 1 | 1.26594 | 1 | 1 | 2 | 2 | 4 | 46 |

### No-NIFS concentration

| Measure | Requested rows | Selected rows | Cumulative count | Population share |
| --- | ---: | ---: | ---: | ---: |
| Occurrences | 1 | 1 | 4063817 | 0.0686216 |
| Occurrences | 2 | 2 | 6535456 | 0.110358 |
| Occurrences | 10 | 10 | 11359062 | 0.191809 |
| Occurrences | 100 | 100 | 19892142 | 0.335899 |
| DOI-affiliation pairs | 1 | 1 | 610513 | 0.0214359 |
| DOI-affiliation pairs | 2 | 2 | 1197272 | 0.0420378 |
| DOI-affiliation pairs | 10 | 10 | 3017319 | 0.105942 |
| DOI-affiliation pairs | 100 | 100 | 7314484 | 0.256821 |

## Excluded population

| Measure | Count |
| --- | ---: |
| Occurrences | 275365699 |
| DOI-affiliation pairs | 83453199 |
| Valid ROR-assigned occurrences | 275365699 |
| Invalid explicit ROR-assigned occurrences | 0 |
| Valid ROR-assigned DOI-affiliation pairs | 83453199 |
| Invalid explicit ROR-assigned DOI-affiliation pairs | 0 |
| Distinct DOI population | 41649224 |
| Normalized affiliations touched | 4 |
| normalized affiliation removed entirely | 1 |

## Per-prefix overlap summaries

Quantiles treat each DOI prefix as one observation; weighted means use the corresponding occurrence or DOI-affiliation-pair denominator.

| Rate | Prefixes | Minimum | p25 | Median | p75 | Maximum | Weighted mean |
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| Occurrence overlap | 2865 | 0 | 0.5 | 0.93593 | 1 | 1 | 0.954922 |
| DOI-affiliation-pair overlap | 2865 | 0 | 0.499085 | 0.914894 | 1 | 1 | 0.913891 |

## ROR assignment coverage

Only explicit valid canonical ROR IDs are ranked. Invalid explicit assignments remain in coverage counts.

| Measure | Full population | No-NIFS |
| --- | ---: | ---: |
| Exact affiliations with a valid canonical ROR ID | 71311 | 71310 |
| Normalized affiliations with a valid canonical ROR ID | 68644 | 68643 |
| Valid ROR-assigned occurrences | 294617048 | 19251349 |
| Valid ROR-assigned occurrence share | 0.880541 | 0.325078 |
| Valid ROR-assigned DOI-affiliation pairs | 90873572 | 7420373 |
| Valid ROR-assigned DOI-affiliation-pair share | 0.811849 | 0.260539 |
| Invalid explicit ROR-assigned occurrences | 14017 | 14017 |
| Invalid explicit ROR-assigned occurrence share | 4.18935e-05 | 0.000236691 |
| Invalid explicit ROR-assigned DOI-affiliation pairs | 8085 | 8085 |
| Invalid explicit ROR-assigned DOI-affiliation-pair share | 7.223e-05 | 0.000283875 |
| Valid canonical ROR IDs | 40595 | 40595 |

## Most common explicit ROR IDs

The tables show the first 20 of the 100 retained JSON ranking rows. ROR DOI support counts distinct DOIs and can sum above valid-assigned DOI-affiliation pairs when one pair has different IDs across occurrences.

### By occurrence support

| ROR ID | Occurrences | Distinct DOIs |
| --- | ---: | ---: |
| https://ror.org/01t3wyv61 | 275210969 | 41649237 |
| https://ror.org/02tyer376 | 4063629 | 586679 |
| https://ror.org/02skbsp27 | 421818 | 210780 |
| https://ror.org/03mrbr458 | 292760 | 186947 |
| https://ror.org/0287jta43 | 254134 | 128599 |
| https://ror.org/03p74gp79 | 226798 | 215718 |
| https://ror.org/0130frc33 | 178290 | 82336 |
| https://ror.org/052gg0110 | 134590 | 106682 |
| https://ror.org/057py8t43 | 115917 | 115906 |
| https://ror.org/03v76x132 | 101443 | 17470 |
| https://ror.org/04chrp450 | 92869 | 89149 |
| https://ror.org/041kmwe10 | 76058 | 39990 |
| https://ror.org/02e16g702 | 75380 | 71435 |
| https://ror.org/043pwc612 | 73938 | 69725 |
| https://ror.org/0220qvk04 | 73073 | 15978 |
| https://ror.org/04knth696 | 72640 | 72640 |
| https://ror.org/05dxps055 | 64581 | 61762 |
| https://ror.org/02drdmm93 | 64443 | 12859 |
| https://ror.org/00a2xv884 | 57788 | 13134 |
| https://ror.org/013q1eq08 | 57334 | 11971 |

### By distinct DOI support

| ROR ID | Occurrences | Distinct DOIs |
| --- | ---: | ---: |
| https://ror.org/01t3wyv61 | 275210969 | 41649237 |
| https://ror.org/02tyer376 | 4063629 | 586679 |
| https://ror.org/03p74gp79 | 226798 | 215718 |
| https://ror.org/02skbsp27 | 421818 | 210780 |
| https://ror.org/03mrbr458 | 292760 | 186947 |
| https://ror.org/0287jta43 | 254134 | 128599 |
| https://ror.org/057py8t43 | 115917 | 115906 |
| https://ror.org/052gg0110 | 134590 | 106682 |
| https://ror.org/04chrp450 | 92869 | 89149 |
| https://ror.org/0130frc33 | 178290 | 82336 |
| https://ror.org/04knth696 | 72640 | 72640 |
| https://ror.org/02e16g702 | 75380 | 71435 |
| https://ror.org/043pwc612 | 73938 | 69725 |
| https://ror.org/05dxps055 | 64581 | 61762 |
| https://ror.org/041kmwe10 | 76058 | 39990 |
| https://ror.org/03r8z3t63 | 48207 | 38695 |
| https://ror.org/05591te55 | 48518 | 32091 |
| https://ror.org/02bvcjw39 | 32781 | 25907 |
| https://ror.org/031rekg67 | 35675 | 24417 |
| https://ror.org/01rxfrp27 | 50885 | 23849 |

### No-NIFS by occurrence support

| ROR ID | Occurrences | Distinct DOIs |
| --- | ---: | ---: |
| https://ror.org/02tyer376 | 4063629 | 586679 |
| https://ror.org/02skbsp27 | 421818 | 210780 |
| https://ror.org/03mrbr458 | 292760 | 186947 |
| https://ror.org/0287jta43 | 254134 | 128599 |
| https://ror.org/03p74gp79 | 226798 | 215718 |
| https://ror.org/0130frc33 | 178290 | 82336 |
| https://ror.org/052gg0110 | 134590 | 106682 |
| https://ror.org/057py8t43 | 115917 | 115906 |
| https://ror.org/03v76x132 | 101443 | 17470 |
| https://ror.org/041kmwe10 | 76058 | 39990 |
| https://ror.org/043pwc612 | 73938 | 69725 |
| https://ror.org/0220qvk04 | 73073 | 15978 |
| https://ror.org/04knth696 | 72640 | 72640 |
| https://ror.org/05dxps055 | 64581 | 61762 |
| https://ror.org/02drdmm93 | 64443 | 12859 |
| https://ror.org/00a2xv884 | 57788 | 13134 |
| https://ror.org/013q1eq08 | 57334 | 11971 |
| https://ror.org/034t30j35 | 54155 | 14925 |
| https://ror.org/0064kty71 | 52250 | 11734 |
| https://ror.org/00p991c53 | 51037 | 9255 |

### No-NIFS by distinct DOI support

| ROR ID | Occurrences | Distinct DOIs |
| --- | ---: | ---: |
| https://ror.org/02tyer376 | 4063629 | 586679 |
| https://ror.org/03p74gp79 | 226798 | 215718 |
| https://ror.org/02skbsp27 | 421818 | 210780 |
| https://ror.org/03mrbr458 | 292760 | 186947 |
| https://ror.org/0287jta43 | 254134 | 128599 |
| https://ror.org/057py8t43 | 115917 | 115906 |
| https://ror.org/052gg0110 | 134590 | 106682 |
| https://ror.org/0130frc33 | 178290 | 82336 |
| https://ror.org/04knth696 | 72640 | 72640 |
| https://ror.org/043pwc612 | 73938 | 69725 |
| https://ror.org/05dxps055 | 64581 | 61762 |
| https://ror.org/041kmwe10 | 76058 | 39990 |
| https://ror.org/03r8z3t63 | 48207 | 38695 |
| https://ror.org/05591te55 | 48518 | 32091 |
| https://ror.org/02bvcjw39 | 32781 | 25907 |
| https://ror.org/031rekg67 | 35675 | 24417 |
| https://ror.org/01rxfrp27 | 50885 | 23849 |
| https://ror.org/04d836q62 | 49520 | 21929 |
| https://ror.org/048a87296 | 35832 | 21219 |
| https://ror.org/02jx3x895 | 46025 | 20657 |