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iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) vs USD/BRL Exchange Rate
Correlation
of % moves
+18%
In sync
of periods
57%
History
daysdays · through 2026-05-15
1,238
These move in the same direction about 57% of the time
Their swing sizes only faintly line up (~3% of the pattern is shared).
A faint pattern — interesting as colour, not strong enough to act on alone.
On a log scale so equal % moves take equal vertical space — best when one series has grown much faster than the other.
What to Watch
Unusual right now
Recently tighter than usual — the pair is behaving differently than its long-run pattern.
Decouples in drawdowns
The relationship weakens when both prices are falling — don't count on this pair as a hedge under stress.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
57.0%
Headline metric
Movement correlation(i)
+18%
Based on % moves
95% CI
+13% → +24%
Likely range of correlation
Pipeline
Pipeline Summary
1,238 paired data points survived the daily window.
Raw input
1,254
7,868
Normalized
1,254
7,868
Prepared
1,254
7,868
Aligned
1,238
1,238
Invalid removed
R²(i)
3.4%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points
1,238
Deep
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: -6 to 6 days.
Selected shift
No shift
Correlation at this shift
+18%
No shift — both series at their actual dates.
1,237 overlapping points at this shift
Baseline
+18%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+18%
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
+45%
63 periods · Return correlation when both series rose
Both Falling
+15%
88 periods · Return correlation when both series fell
Diverging
-48%
98 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
6,646
A: 16 / B: 6630
Series A
iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX)
VXX
Stock · 1,254 raw → 1,254 prepared
Series B
USD/BRL Exchange Rate
DEXBZUS
FRED · 7,868 raw → 7,868 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
5
Estimated crossover points between normalized spreads.
Slope
0.0363
Linear regression slope.
Intercept
0.0001
Linear regression intercept.
Saved 2 weeks ago · ID: fred-dexbzus_stock-vxx_daily_5y