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Correlation
of % moves
+3%
In sync
of periods
54%
History
daysdays · through 2026-05-22
588
These move in the same direction about 54% of the time
Their swing sizes barely line up — almost no shared pattern.
Roughly random — these don't track each other in a meaningful way.
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.
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
54.1%
Headline metric
Movement correlation(i)
+3%
Based on % moves
95% CI
-5% → +11%
Likely range of correlation
Pipeline
Pipeline Summary
588 paired data points survived the daily window.
Raw input
1,252
588
Normalized
1,252
588
Prepared
1,252
588
Aligned
588
588
Invalid removed
R²(i)
0.1%
Variance explained
Significance
n.s.
Statistical confidence
Data points
588
Robust
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
+3%
No shift — both series at their actual dates.
586 overlapping points at this shift
Baseline
+3%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+3%
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
-6%
69 periods · Return correlation when both series rose
Both Falling
-7%
60 periods · Return correlation when both series fell
Diverging
-19%
118 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
664
A: 664 / B: 0
Series A
Biogen Inc. Common Stock (BIIB)
BIIB
Stock · 1,252 raw → 1,252 prepared
Series B
Velo3D, Inc. Common stock (VELO)
VELO
Stock · 588 raw → 588 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
9
Estimated crossover points between normalized spreads.
Slope
0.0633
Linear regression slope.
Intercept
0.0033
Linear regression intercept.
Saved 2 weeks ago · ID: stock-biib_stock-velo_daily_5y