Pith Number

pith:YA6XRXKW

pith:2026:YA6XRXKW5FZILXD4FQBM7DZ2NV

not attested not anchored not stored refs pending

Fixed-order PCA: Theory for Overestimated Factor Models

Dacheng Xiu, Wanjie Wang, Xin Tong, Yuan Liao

arxiv:2605.18448 v1 · 2026-05-18 · math.ST · econ.EM · 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{YA6XRXKW5FZILXD4FQBM7DZ2NV}

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	2026-05-20T00:06:01.570560Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c03d78dd56e97285dc7c2c02cf8f3a6d6e42b2bf4709fcd6084da2f95103981e

Aliases

arxiv: 2605.18448 · arxiv_version: 2605.18448v1 · doi: 10.48550/arxiv.2605.18448 · pith_short_12: YA6XRXKW5FZI · pith_short_16: YA6XRXKW5FZILXD4 · pith_short_8: YA6XRXKW

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/YA6XRXKW5FZILXD4FQBM7DZ2NV \
  | 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: c03d78dd56e97285dc7c2c02cf8f3a6d6e42b2bf4709fcd6084da2f95103981e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3c4ff8147b13076c1aacf2211912e8b29825d38f0ec88e945b670c61f79ea701",
    "cross_cats_sorted": [
      "econ.EM",
      "stat.TH"
    ],
    "license": "http://creativecommons.org/publicdomain/zero/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2026-05-18T14:17:49Z",
    "title_canon_sha256": "8cbbe6c445a8063033b73042bc3707258bfc102abf91323325ed32f913c58701"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.18448",
    "kind": "arxiv",
    "version": 1
  }
}