Pith Number

pith:TQPRHX7B

pith:2026:TQPRHX7BAXMDLYHC2JRPIMGGRY

not attested not anchored not stored refs pending

De-floored Principal Component Regression: When Rank Selection Alone Is Insufficient for Prediction

Peng Zhao

arxiv:2607.16638 v1 · 2026-07-18 · math.ST · cs.LG · stat.ME · 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{TQPRHX7BAXMDLYHC2JRPIMGGRY}

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	2026-07-21T01:20:19.771941Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9c1f13dfe105d835e0e2d262f430c68e380f189649216e5a540fd9d377453cdb

Aliases

arxiv: 2607.16638 · arxiv_version: 2607.16638v1 · doi: 10.48550/arxiv.2607.16638 · pith_short_12: TQPRHX7BAXMD · pith_short_16: TQPRHX7BAXMDLYHC · pith_short_8: TQPRHX7B

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/TQPRHX7BAXMDLYHC2JRPIMGGRY \
  | 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: 9c1f13dfe105d835e0e2d262f430c68e380f189649216e5a540fd9d377453cdb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "931ead5d56d8afc64952df2ebacbecb221934d8d26592e8865b76aab66892e53",
    "cross_cats_sorted": [
      "cs.LG",
      "stat.ME",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2026-07-18T04:50:59Z",
    "title_canon_sha256": "97d59958dbabec32e48e86fb3e43b6a8f0444aca69f27230407027e55a9a1014"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.16638",
    "kind": "arxiv",
    "version": 1
  }
}