Pith Number

pith:J64ZMQTZ

pith:2011:J64ZMQTZVSRSEY5OP6QGS6HKIO

not attested not anchored not stored refs pending

Missing data in value-added modeling of teacher effects

Daniel F. McCaffrey, J. R. Lockwood

arxiv:1108.2167 v1 · 2011-08-10 · stat.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{J64ZMQTZVSRSEY5OP6QGS6HKIO}

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	2026-05-18T04:15:49.214724Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4fb9964279aca32263ae7fa06978ea43acd71ebc9e19aea8e0e35471bab0ce83

Aliases

arxiv: 1108.2167 · arxiv_version: 1108.2167v1 · doi: 10.48550/arxiv.1108.2167 · pith_short_12: J64ZMQTZVSRS · pith_short_16: J64ZMQTZVSRSEY5O · pith_short_8: J64ZMQTZ

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/J64ZMQTZVSRSEY5OP6QGS6HKIO \
  | 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: 4fb9964279aca32263ae7fa06978ea43acd71ebc9e19aea8e0e35471bab0ce83

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "49093d45d9cd5576b5419ad87f50b1a65a5add59b13c4ac4a25cd18f4cf0ce46",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.AP",
    "submitted_at": "2011-08-10T12:51:42Z",
    "title_canon_sha256": "c96fdddb9d5231ac1933790a88c8d6dcf5c4456ac205f725e6129d09daa47dca"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1108.2167",
    "kind": "arxiv",
    "version": 1
  }
}