Pith Number

pith:W2ZWTYF7

pith:2019:W2ZWTYF7LODTVCZZIT5J5TVPKG

not attested not anchored not stored refs pending

ppmlhdfe: Fast Poisson Estimation with High-Dimensional Fixed Effects

Paulo Guimar\~aes, Sergio Correia, Thomas Zylkin

arxiv:1903.01690 v3 · 2019-03-05 · econ.EM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W2ZWTYF7LODTVCZZIT5J5TVPKG}

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	2026-07-05T04:42:52.444113Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b6b369e0bf5b873a8b3944fa9eceaf51a48205a2a87c820165947ca6a69ab452

Aliases

arxiv: 1903.01690 · arxiv_version: 1903.01690v3 · doi: 10.48550/arxiv.1903.01690 · pith_short_12: W2ZWTYF7LODT · pith_short_16: W2ZWTYF7LODTVCZZ · pith_short_8: W2ZWTYF7

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/W2ZWTYF7LODTVCZZIT5J5TVPKG \
  | 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: b6b369e0bf5b873a8b3944fa9eceaf51a48205a2a87c820165947ca6a69ab452

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "991718bd4651051bb67f5e7c834b88f376df4b8ee6b916bcab0ea73b0cfd8eff",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "econ.EM",
    "submitted_at": "2019-03-05T06:11:26Z",
    "title_canon_sha256": "b592e762e57bca9bf7390dddc7ae108748d16c3e49c6ef61e439240462474a2a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.01690",
    "kind": "arxiv",
    "version": 3
  }
}