Pith Number

pith:Z645UBNE

pith:2018:Z645UBNECUSLI7G53KROXDANN3

not attested not anchored not stored refs pending

Shrinkage estimation of large covariance matrices using multiple shrinkage targets

Catalina A. Vallejos, Gwena\"el G.R. Leday, Harry Gray, Sylvia Richardson

arxiv:1809.08024 v1 · 2018-09-21 · stat.ME · stat.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Z645UBNECUSLI7G53KROXDANN3}

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	2026-05-18T00:05:10.530397Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cfb9da05a41524b47cdddaa2eb8c0d6ef6a8912397d2cd808916001ade638320

Aliases

arxiv: 1809.08024 · arxiv_version: 1809.08024v1 · doi: 10.48550/arxiv.1809.08024 · pith_short_12: Z645UBNECUSL · pith_short_16: Z645UBNECUSLI7G5 · pith_short_8: Z645UBNE

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/Z645UBNECUSLI7G53KROXDANN3 \
  | 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: cfb9da05a41524b47cdddaa2eb8c0d6ef6a8912397d2cd808916001ade638320

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "553facdc77c2c28d77b171fc38261c12f31308a5f5fad3e0f17ec48703c0de02",
    "cross_cats_sorted": [
      "stat.AP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2018-09-21T10:34:31Z",
    "title_canon_sha256": "570c7f9922852887bcc58456f50d1bb4b0d9fc9ae7c4482f173b67e8f01082b2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.08024",
    "kind": "arxiv",
    "version": 1
  }
}