The 20 most similar historical sessions across 25 features, and what followed them.
Prior close profile (2026-09-15, QQQ $704.54): session -0.65% · 5-day -1.92% · vs 200-DMA +6.6% · below 52-week high -5.6% · RSI2=16 · VIX 17.2 · policy rate 3.63% (1-year -0.70)
Closest analog 2024-11-04 (distance 0.36): session -0.29% · 5-day -1.90% · vs 200-DMA +5.9% · below 52-week high -3.4% · RSI2=30 · VIX 22.0 · policy rate 4.83% (1-year -0.50)
What followed: next day +1.28% ·
5-day +5.73% ·
20-day +6.35%
Side by side | 2026-09-15 (prior session) -0.65% ↔ 2024-11-04 -0.29%; today maps to the day after 2024-11-04, which was +1.28% (single days are mostly coincidence — the Top-20 statistics below are more reliable)
| Analog (top 5) | Distance |
That day |
Next day |
5 days on |
RSI2 then |
20 days on |
| 2024-11-04 |
0.36 |
-0.29% |
+1.28% |
+5.73% |
30 |
+6.35% |
| 2017-08-21 |
0.38 |
-0.13% |
+1.52% |
+0.96% |
10 |
+3.37% |
| 2015-06-08 |
0.41 |
-1.02% |
-0.17% |
+0.02% |
4 |
-0.20% |
| 2015-03-31 |
0.45 |
-1.06% |
-0.52% |
+0.98% |
35 |
+3.55% |
| 2018-09-17 |
0.46 |
-1.44% |
+0.83% |
+1.41% |
16 |
-5.03% |
Top-20 analog statistics (deduplicated — far more reliable than any single day):
Next day mean +0.14% (up 60% of the time, range -2.5% to +2.9%) · 5-day +1.01% (80%) · 20-day +1.91% (70%)
Note: QQQ drifts up over time, so the unconditional probability of any given next day being positive is already about 55%. Compare the “up %” above against that baseline, not against 50%.
25 features in three equally weighted groups: price position (return / distance to moving averages / position in the 52-week range / trend slope / consecutive up-down days / gaps) + technicals (RSI2 / RSI14 / volatility / relative volume / volume trend / range / KDJ-J / Bollinger %B / MACD histogram) + environment (VIX / rate cycle / credit spreads / dollar index / oil / S&P P/E / CBOE equity P/C / AAII bull-bear spread). Weighted z-score Euclidean distance; matching pool 1999-03-22–2026-09-15 (6914 days, excluding ±60 days around the target). Narrative context, not a trading signal: after four rounds of feature engineering the Top-1 next-day directional hit rate tops out at 54.9%, still below the 57% you get by always guessing up. The data is given in full, but do not use it for direction — it answers “which historical setup does today resemble”, not “will tomorrow be up or down”.
Research output, not investment advice.