Pith Number

pith:Y5WQLFRG

pith:2022:Y5WQLFRGX6IPCRWQWHURNRSUVC

not attested not anchored not stored refs pending

Difference in Differences with Time-Varying Covariates

Brantly Callaway, Carolina Caetano, Hugo Sant'Anna Rodrigues, Stroud Payne

arxiv:2202.02903 v3 · 2022-02-07 · 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{Y5WQLFRGX6IPCRWQWHURNRSUVC}

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

2 papers in Pith

Group-Level Treatment Effect Heterogeneity in Difference-in-Differences: A Balanced Approach

A formal approach to variable selection in difference-in-differences

Receipt and verification

First computed	2026-07-05T08:35:33.028771Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c76d059626bf90f146d0b1e916c654a88ec2ba186a767e7779cba123c28ad1a8

Aliases

arxiv: 2202.02903 · arxiv_version: 2202.02903v3 · doi: 10.48550/arxiv.2202.02903 · pith_short_12: Y5WQLFRGX6IP · pith_short_16: Y5WQLFRGX6IPCRWQ · pith_short_8: Y5WQLFRG

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/Y5WQLFRGX6IPCRWQWHURNRSUVC \
  | 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: c76d059626bf90f146d0b1e916c654a88ec2ba186a767e7779cba123c28ad1a8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5ab9309e3d66c8b98b63e26c310c132c6ddc2e8228c3edc06dddea69fa52beea",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "econ.EM",
    "submitted_at": "2022-02-07T01:50:18Z",
    "title_canon_sha256": "29275b0a786ad7b933086929efff77e3b0417176a9e3aef0d176328fe4c16cf6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2202.02903",
    "kind": "arxiv",
    "version": 3
  }
}