NursingWave v0.1: zone-level dynamics of home-visit nursing supply across Japan's secondary medical zones, 2020–2026

Semiannual panel (12 waves, Dec 2020–Jun 2026) of all home-visit nursing providers in Japan, aggregated to 330 secondary medical zones. Indicators: supply density per 75+ population, cumulative net entry, turnover, corporate-group HHI, and NDB C007 instruction volumes. Includes SHA-256 manifest of all 48 source files, full pipeline code, and tests. Companion to the medRxiv preprint "NursingWave" and the interactive viewer at https://nursingwave-526642979039.asia-northeast1.run.app. / 日本の訪問看護事業所の半年刻み12波パネル(2020.12–2026.6)を330二次医療圏に集計したデータセット・コード一式。CC BY 4.0。