SeriesMagCorrSyncOverlapThrough
Correlation
of % moves
-30%
In sync
of periods
22%
History
daysdays · through 2026-04-30
1,251
These move opposite each other about 22% of the time
Their swing sizes only faintly mirror each other (~9% 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
Unusual right now
Recently looser 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.
Explore
Advanced
Statistics
In sync(i)
22.3%
Headline metric
Movement correlation(i)
-30%
Based on % moves
95% CI
-35% → -25%
Likely range of correlation
Pipeline
Pipeline Summary
1,251 paired data points survived the daily window.
Raw input
9,176
1,255
Normalized
9,176
1,255
Prepared
9,176
1,255
Aligned
1,251
1,251
Invalid removed
R²(i)
9.2%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points
1,251
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
-30%
No shift — both series at their actual dates.
1,251 overlapping points at this shift
Baseline
-30%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-30%
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
-55%
18 periods · Return correlation when both series rose
Both Falling
+8%
17 periods · Return correlation when both series fell
Diverging
-87%
214 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
7,929
A: 7925 / B: 4
Series A
VIX
VIXCLS
FRED · 9,176 raw → 9,176 prepared
Series B
SPY
Stock · 1,255 raw → 1,255 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
15
Estimated crossover points between normalized spreads.
Slope
-5.6317
Linear regression slope.
Intercept
612.4124
Linear regression intercept.
Saved 4 days ago · ID: fred-vixcls_stock-spy_5y
Explore
Top 10 by absolute correlation
Ranked across both sides of this comparison using the same dense row format as the single-symbol correlations view.