Pith Number

pith:E53LY2FL

pith:2024:E53LY2FLLM5CWSKRXOGFQQDFHP

not attested not anchored not stored refs pending

On an EM-based closed-form solution for 2 parameter IRT models

Augustin Kelava (1) ((1) Methods Center, Roberto Faleh (1), Stefano Noventa (1), University of Tuebingen)

arxiv:2411.18351 v1 · 2024-11-27 · stat.ME · stat.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{E53LY2FLLM5CWSKRXOGFQQDFHP}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T09:41:15.530220Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2776bc68ab5b3a2b4951bb8c5840653beeff866095f202900873fdb549c9aae1

Aliases

arxiv: 2411.18351 · arxiv_version: 2411.18351v1 · doi: 10.48550/arxiv.2411.18351 · pith_short_12: E53LY2FLLM5C · pith_short_16: E53LY2FLLM5CWSKR · pith_short_8: E53LY2FL

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/E53LY2FLLM5CWSKRXOGFQQDFHP \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 2776bc68ab5b3a2b4951bb8c5840653beeff866095f202900873fdb549c9aae1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "67d6748012bbc933a6d06a964c9b1dcd8d1b15b0eace8097512dcd5784e8e68e",
    "cross_cats_sorted": [
      "stat.CO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2024-11-27T13:55:06Z",
    "title_canon_sha256": "11c2692ad0186d1f231a8bed0388b2737c4c9d1065f4f0db73f53b4be5f3a881"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2411.18351",
    "kind": "arxiv",
    "version": 1
  }
}