Table 2 Mean of topicality \(\pmb{\mathit{Top}(a_{t,k})}\) of RTRS news for GM, IBM, PFE, AAPL, and YHOO
From: Novel and topical business news and their impact on stock market activity
| Â | GM | IBM | PFE | AAPL | YHOO |
|---|---|---|---|---|---|
ALERT | 0.696 | 0.863 | 0.969 | 0.778 | 0.778 |
HEADLINE | 0.175 | 0.171 | 0.245 | 0.106 | 0.119 |