The story
Jefferies raised its rating on Centrica to buy, arguing investors are overly concentrated on its trading business, and the shares rose.
The story's tone is the average of its headlines' own scores. Each score rates how good or bad the news was for the company, from −10 (clearly bad) to +10 (clearly good). 0 is neutral, and anything beyond ±6 is strong and rare. It rates the coverage, not the share price.