From Noisy News Sentiment Scores to Interpretable Temporal Dynamics: A Bayesian State-Space Model
从含噪新闻情绪分数到可解释的时间动态:贝叶斯状态空间模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以周度情绪序列的潜在动态、观测噪声和状态空间平滑为核心,直接支持时间序列分类,但未开展收益预测。
从含噪新闻情绪分数到可解释的时间动态:贝叶斯状态空间模型AI 解读 ↓
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Text-based sentiment indicators are widely used to monitor public and market mood, but weekly sentiment series are noisy by construction. A main reason is that the amount of relevant news changes over time and across categories. As a result, some weekly averages are based on many articles, while others rely on only a few. Existing approaches do not explicitly account for changes in data availability when measuring uncertainty. We present a Bayesian state-space framework that turns aggregated news sentiment into a smoothed time series with uncertainty. The model treats each weekly sentiment value as a noisy measurement of an underlying sentiment process, with observation uncertainty scaled by the effective information weight $n_{tj}$: when coverage is high, latent sentiment is anchored more strongly to the observed aggregate; when coverage is low, inference relies more on the latent dynamics and uncertainty increases. Using news data grouped into multiple categories, we find broadly similar latent dynamics across categories, while larger differences appear in observation noise. The framework is designed for descriptive monitoring and can be extended to other text sources where information availability varies over time.