This index, updated in real-time on weekdays, is primarily used to monitor the short-term outlook of thermal coal market participants. Ranging 0-1, a reading of 0.5 means market sentiment is neutral. Above 0.5 signals a bullish market, with 1 being the most bullish. Below 0.5 indicates a bearish market, with 0 being the most bearish.

1. Establish a Sentiment Labeling Model
The model is trained using text data from Fenwei's proprietary market pricing records.

2. Real-time Sentiment Prediction
Once the model is optimized and running stably, it performs real-time predictions on incoming text data from live pricing records to output a sentiment classification (e.g., Bullish, Bearish, Neutral) for each piece of research data.

3. Calculate the Sentiment Diffusion Index
A Sentiment Diffusion Index is calculated based on the classification results of the research data.

Formula:
Index = (% of "Bullish" responses) * 1 + (1 - % of "Bullish" responses - % of "Bearish" responses) * 0.5