Research on the Time-Varying Mechanism of Market Sentiment of Artificial Intelligence Industry Stocks Based on Multi-Factor PCA-HMM Framework. Journal of Science, Innovation & Social Impact, [S. l.], v. 1, n. 2, p. 18–23, 2025. Disponível em: https://sagespress.com/index.php/JSISI/article/view/48. Acesso em: 15 jan. 2026.