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2x Long VIX Futures ETF (UVIX) vs St. Louis Financial Stress Index
Correlation
of % moves
+64%
In sync
of periods
69%
History
weeksweeks · through 2026-34
230
These move in the same direction about 69% of the time
When one swings, the other often swings by a similar amount (~41% of the pattern is shared).
Strong enough to use as a signal — check the stability and regime notes below before relying on it.
Both lines start at the same point — easy to compare when growth rates are similar.
What to Watch
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Swings around
Their relationship swings around — sometimes tight, sometimes loose. Don't trust a single snapshot.
Advanced
Statistics
In sync(i)
69%
Headline metric
Movement correlation(i)
+64%
Based on % moves
95% CI
+56% → +71%
Likely range of correlation
Pipeline
Pipeline Summary
230 paired data points survived the weekly window.
Raw input
1,113
1,704
Normalized
1,113
1,704
Prepared
232
1,704
Aligned
230
230
Invalid removed
R²(i)
41%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
229
Usable
Time-Shifted Correlation
See how correlation changes when one series is offset in time. A taller bar at a non-zero shift means the two move together better when one leads the other — that's a potential lead/lag signal.
Correlation by shift
Click a bar to inspect. Range: -12 to 12 weeks.
Selected shift
No shift
Correlation at this shift
+64%
No shift — both series at their actual dates.
229 overlapping points at this shift
Baseline
+64%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+64%
A non-zero peak suggests one series lines up better when shifted against the other.
Stability
How the correlation evolves over time. A stable line means the relationship is reliable; large swings signal regime-dependent behavior.
Do They Crash Together?
How these series behave when markets are rising, falling, or diverging. A correlation that holds in drawdowns is very different from one that only works in rallies.
Both Rising
+26%
65 periods · Return correlation when both series rose
Both Falling
+23%
93 periods · Return correlation when both series fell
Diverging
-46%
71 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,476
A: 2 / B: 1474
Series A
2x Long VIX Futures ETF (UVIX)
UVIX
Stock · 1,113 raw → 232 prepared
Series B
St. Louis Financial Stress Index
STLFSI4
FRED · 1,704 raw → 1,704 prepared
Sign agreement
9.1%
How often both values share the same sign.
Zero crossings
1
Estimated crossover points between normalized spreads.
Slope
1.0551
Linear regression slope.
Intercept
0.0361
Linear regression intercept.
Saved 4 months ago · ID: fred-stlfsi4_stock-uvix_weekly_5y