Pith Number

pith:HKMHKJ6I

pith:2025:HKMHKJ6IQMSFZAHMYNRPRMOKNW

not attested not anchored not stored refs pending

When can we get away with using the two-way fixed effects regression?

Apoorva Lal

arxiv:2503.05125 v1 · 2025-03-07 · 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{HKMHKJ6IQMSFZAHMYNRPRMOKNW}

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.

Cited by

1 paper in Pith

Efficient Difference-in-Differences and Event Study Estimators

Receipt and verification

First computed	2026-07-05T10:26:21.485707Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3a987527c883245c80ecc362f8b1ca6dbba3fb50b64547a1724919f978d5392e

Aliases

arxiv: 2503.05125 · arxiv_version: 2503.05125v1 · doi: 10.48550/arxiv.2503.05125 · pith_short_12: HKMHKJ6IQMSF · pith_short_16: HKMHKJ6IQMSFZAHM · pith_short_8: HKMHKJ6I

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/HKMHKJ6IQMSFZAHMYNRPRMOKNW \
  | 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: 3a987527c883245c80ecc362f8b1ca6dbba3fb50b64547a1724919f978d5392e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "687a38f3a3d044ea8829c0e5ec9e06e3b457dd8d94e97d63cca66bbc006d96d5",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "econ.EM",
    "submitted_at": "2025-03-07T04:02:38Z",
    "title_canon_sha256": "27cf70031c89d9df5b618fcc8e57dceaf99490fa3f830825f0d74b4fff8f0cab"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2503.05125",
    "kind": "arxiv",
    "version": 1
  }
}