One ratio that has been reliable for me in the past is SPX/VIX. When this ratio stays above 80, the probability of decline increases with each passing day. Back in April, it hit 100% and sold off. So if we stay above 80, below are probabilities after each trading day.
| Probability Of Down | Date | |
| 1 TD later | 67% | 3-Aug |
| 2 TD later | 50% | 6-Aug |
| 3 TD later | 42% | 7-Aug |
| 4 TD later | 57% | 8-Aug |
| 5 TD later | 61% | 9-Aug |
| 6 TD later | 57% | 10-Aug |
| 7 TD later | 65% | 13-Aug |
| 8 TD later | 65% | 14-Aug |
| 9 TD later | 70% | 15-Aug |
| 10 TD later | 74% | 16-Aug |
| 11 TD later | 74% | 17-Aug |
| 12 TD later | 74% | 20-Aug |
| 13 TD later | 83% | 21-Aug |
| 14 TD later | 78% | 22-Aug |
| 15 TD later | 83% | 23-Aug |
| 16 TD later | 83% | 24-Aug |
| 17 TD later | 87% | 27-Aug |
| 18 TD later | 83% | 28-Aug |
| 19 TD later | 91% | 29-Aug |
| 20 TD later | 91% | 30-Aug |
| 21 TD later | 100% | 31-Aug |
| 22 TD later | 100% | |
| 23 TD later | 100% | |
| 24 TD later | 100% | |
| 25 TD later | 100% | |
| 26 TD later | 100% | |
| 27 TD later | 96% | |
| 28 TD later | 96% | |
| 29 TD later | 96% | |
| 30 TD later | 96% |
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