Pith Number

pith:OC6BIH2L

pith:2018:OC6BIH2LYZ7W3AMREE42N4X5WA

not attested not anchored not stored refs pending

Difference-in-Differences with Multiple Time Periods

Brantly Callaway, Pedro H. C. Sant'Anna

arxiv:1803.09015 v4 · 2018-03-23 · econ.EM · math.ST · stat.AP · 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{OC6BIH2LYZ7W3AMREE42N4X5WA}

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

Choosing A Headline Estimand from Matching, DID, and Hybrid Designs: A Minimax-Regret Approach

Receipt and verification

First computed	2026-07-05T01:55:40.893469Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

70bc141f4bc67f6d81912139a6f2fdb007cf395d56a2649b96987078b280eec9

Aliases

arxiv: 1803.09015 · arxiv_version: 1803.09015v4 · doi: 10.48550/arxiv.1803.09015 · pith_short_12: OC6BIH2LYZ7W · pith_short_16: OC6BIH2LYZ7W3AMR · pith_short_8: OC6BIH2L

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/OC6BIH2LYZ7W3AMREE42N4X5WA \
  | 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: 70bc141f4bc67f6d81912139a6f2fdb007cf395d56a2649b96987078b280eec9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bca1d2fa59e65d7c1e4d478e675a6603ef8d8792796d91d17928ea43f86989a2",
    "cross_cats_sorted": [
      "math.ST",
      "stat.AP",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "econ.EM",
    "submitted_at": "2018-03-23T23:45:05Z",
    "title_canon_sha256": "1cccf9b71bf6a962c065074de0718bcac2b4ad34614de035ae0fc1483ff967cc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.09015",
    "kind": "arxiv",
    "version": 4
  }
}