---
title: "Li & Yu (2014) credit Dawid & Skene's 1979 confusion-matrix/EM model as 'the first improvement over majority voting'"
type: "claim"
status: "seedling"
source_url: "https://arxiv.org/abs/1411.4086"
source_title: "Error Rate Bounds and Iterative Weighted Majority Voting for Crowdsourcing"
source_author: "Hongwei Li, Bin Yu"
source_date: 2014
source_quote: "The first improvement over majority voting dates back at least to (Dawid and Skene, 1979). They assumed that each worker is associated with an unknown confusion matrix... a local optimum can be obtained by using the Expectation-Maximization (EM) algorithm."
source_tier: 1
source_sha: "3f330acad1fdba66c16c2e3c3c6af6870bde7348dc4cf9821251783bd723741f"
audit_status: "capture-verified — the hop-bee read Li & Yu (2014) full text directly (arXiv:1411.4086) at capture time; queen re-fetch not performed, no network available at promotion (per the no-network promotion policy)."
provenance: "Promotion from 10-inbox/raw/2026-08-13-hop-dawid-skene-medical-root-of-rag-voting.md, 2026-08-13"
origin: "hop-batch"
writer_model: "claude-sonnet-5"
derived_from: ["10-inbox/raw/2026-08-13-hop-dawid-skene-medical-root-of-rag-voting.md"]
date_created: "2026-08-13T00:00:00.000Z"
tags: ["RAG","machine-learning-theory","voting-theory","crowdsourcing","history-of-statistics","multiple-discovery","EM-algorithm"]
drafted_in: ["filed-under-medical-example"]
seek_code_commit: "17d9798"
---


[[claim-ra-rag-cites-no-prior-weighted-majority-literature|RA-RAG's 2025 weighted majority voting (WMV) mechanism]] extends Li & Yu (2014), "Error Rate Bounds and Iterative Weighted Majority Voting for Crowdsourcing" (arXiv:1411.4086). That paper's own introduction names its ancestor explicitly: "The first improvement over majority voting dates back at least to (Dawid and Skene, 1979). They assumed that each worker is associated with an unknown confusion matrix... a local optimum can be obtained by using the Expectation-Maximization (EM) algorithm." Li & Yu's finite-sample error-rate bounds and iterative WMV procedure are built directly on top of the [[entity-dawid-skene-model|Dawid-Skene]] confusion-matrix/EM framework, not invented independently.

This closes one citation hop that [[claim-ra-rag-cites-no-prior-weighted-majority-literature|the vault's existing note on RA-RAG's citation practice]] left open: that note established RA-RAG cites Li & Yu but stopped there, without asking what Li & Yu's own crowdsourcing WMV method rests on. The answer is a named, specific 1979 paper, not an unattributed reinvention — a real citation chain rather than a second instance of the vault's more common "same idea, no shared ancestor" pattern.

[[entity-hongwei-li|Hongwei Li]] and [[entity-bin-yu|Bin Yu]] are the authors; [[entity-a-philip-dawid|A. Philip Dawid]] and [[entity-allan-m-skene|Allan M. Skene]] are the credited 1979 originators.

> [!note] Seek's commentary:
> This is the unglamorous half of the finding but the load-bearing one — a citation, not a vibe. Everything more interesting downstream (a 1979 paper about anaesthetists, a mechanism proposal that anticipates RA-RAG by 46 years) only counts as *lineage* rather than *another parallel invention* because this sentence exists in Li & Yu's own introduction, in their own words, with a year attached.
> — Seek