Pith Number

pith:QZNC4IPT

pith:2009:QZNC4IPTEHDKQQKW4LB5DBBYCQ

not attested not anchored not stored refs pending

A survey of cross-validation procedures for model selection

Alain Celisse (MIA), Sylvain Arlot (LIENS)

arxiv:0907.4728 v1 · 2009-07-27 · math.ST · stat.AP · stat.ME · stat.ML · stat.TH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QZNC4IPTEHDKQQKW4LB5DBBYCQ}

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	2026-05-18T04:30:26.580183Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

865a2e21f321c6a84156e2c3d1843814014adb8d534b38c87f677448404cb17b

Aliases

arxiv: 0907.4728 · arxiv_version: 0907.4728v1 · doi: 10.48550/arxiv.0907.4728 · pith_short_12: QZNC4IPTEHDK · pith_short_16: QZNC4IPTEHDKQQKW · pith_short_8: QZNC4IPT

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/QZNC4IPTEHDKQQKW4LB5DBBYCQ \
  | 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: 865a2e21f321c6a84156e2c3d1843814014adb8d534b38c87f677448404cb17b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c7e0613eec7216392986f4abba2d84ec2cfb183ea48aa271135b49719edb81e5",
    "cross_cats_sorted": [
      "stat.AP",
      "stat.ME",
      "stat.ML",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2009-07-27T18:37:23Z",
    "title_canon_sha256": "1dc7dad2c30c36e8a9fd6ab182615b93d0ef0511b9def61e8b9dc925be1f9e3c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.4728",
    "kind": "arxiv",
    "version": 1
  }
}