Pith Number

pith:QC5SCERI

pith:2014:QC5SCERIVBJGCH2IXYHISCDJ2R

not attested not anchored not stored refs pending

Optimal Multilevel Matching in Clustered Observational Studies: A Case Study of the Effectiveness of Private Schools Under a Large-Scale Voucher System

Jose R. Zubizarreta, Luke Keele

arxiv:1409.8597 v2 · 2014-09-30 · stat.ME

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QC5SCERIVBJGCH2IXYHISCDJ2R}

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	2026-05-18T01:16:03.542855Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

80bb211228a852611f48be0e890869d45c1fe81f4bf9139480df68831aa4263a

Aliases

arxiv: 1409.8597 · arxiv_version: 1409.8597v2 · doi: 10.48550/arxiv.1409.8597 · pith_short_12: QC5SCERIVBJG · pith_short_16: QC5SCERIVBJGCH2I · pith_short_8: QC5SCERI

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/QC5SCERIVBJGCH2IXYHISCDJ2R \
  | 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: 80bb211228a852611f48be0e890869d45c1fe81f4bf9139480df68831aa4263a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c249798244c55372259046460d22e045ddfbdd18b8d53761e2b10c9b55e5b263",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2014-09-30T15:31:22Z",
    "title_canon_sha256": "847de2afe279be11e9a54f8a75c4c10e28cd90b6631c013a4afdbaa8a5d60e6c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1409.8597",
    "kind": "arxiv",
    "version": 2
  }
}