Pith Number

pith:QRZMK6OC

pith:2019:QRZMK6OCHSWJNA3ZGDLL7I5UTS

not attested not anchored not stored refs pending

Ridge regularization for Mean Squared Error Reduction in Regression with Weak Instruments

Karthik Rajkumar

arxiv:1904.08580 v1 · 2019-04-18 · econ.EM · math.ST · 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{QRZMK6OCHSWJNA3ZGDLL7I5UTS}

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	2026-05-17T23:48:13.846105Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8472c579c23cac96837930d6bfa3b49c8886cb2e621e99419901b9d1f8de87c3

Aliases

arxiv: 1904.08580 · arxiv_version: 1904.08580v1 · doi: 10.48550/arxiv.1904.08580 · pith_short_12: QRZMK6OCHSWJ · pith_short_16: QRZMK6OCHSWJNA3Z · pith_short_8: QRZMK6OC

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/QRZMK6OCHSWJNA3ZGDLL7I5UTS \
  | 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: 8472c579c23cac96837930d6bfa3b49c8886cb2e621e99419901b9d1f8de87c3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5eb4e77ea7c490ba68cf68219d509ec4dc639185a649f8d0eba4041f9defee24",
    "cross_cats_sorted": [
      "math.ST",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "econ.EM",
    "submitted_at": "2019-04-18T03:25:52Z",
    "title_canon_sha256": "448c8679fff46016e86839890208aebd16dfb3a9c3131e16267b84bd5eb00957"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.08580",
    "kind": "arxiv",
    "version": 1
  }
}