> For the complete documentation index, see [llms.txt](https://quantit.gitbook.io/quanda/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://quantit.gitbook.io/quanda/us-stock/unstructured/ews-early-warning-signal.md).

# EWS (Early Warning Signal)

- [US sentiment index](https://quantit.gitbook.io/quanda/us-stock/unstructured/ews-early-warning-signal/us-sentiment-index.md): This dataset includes raw and post-processed SARIMA sentiment analysis metrics from business news articles, along with various US market news tone metrics.
- [US EWS Index](https://quantit.gitbook.io/quanda/us-stock/unstructured/ews-early-warning-signal/us-ews-index.md): This dataset includes various S\&P 500 EWS versions from original, and business news sources. It also contains metrics on the tone of US market news.
- [Keyterm Sentiment Analytics Metrics](https://quantit.gitbook.io/quanda/us-stock/unstructured/ews-early-warning-signal/keyterm-sentiment-analytics-metrics.md): This dataset provides metrics on news articles, segmented by sentiment (positive, negative, neutral) and category, including rates and counts of materials.