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Correlation
of % moves
-41%
In sync
of periods
36%
History
daysdays · through 2026-09-09
164
These move in the same direction about 36% of the time
Their swing sizes loosely mirror each other (~17% of the pattern is shared).
A real but noisy link — useful as context, risky as a standalone signal.
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
Slipping looser
The recent pattern is looser than its long-run baseline — keep an eye on whether this sticks.
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Mostly stable
The relationship drifts a little but stays in the same neighbourhood.
Advanced
Statistics
In sync(i)
36%
Headline metric
Movement correlation(i)
-41%
Based on % moves
95% CI
-53% → -27%
Likely range of correlation
Pipeline
Pipeline Summary
164 paired data points survived the daily window.
Raw input
164
1,253
Normalized
164
1,253
Prepared
164
1,253
Aligned
164
164
Invalid removed
R²(i)
17%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
163
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: -6 to 6 days.
Selected shift
No shift
Correlation at this shift
-41%
No shift — both series at their actual dates.
163 overlapping points at this shift
Baseline
-41%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-41%
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
+22%
32 periods · Return correlation when both series rose
Both Falling
-32%
27 periods · Return correlation when both series fell
Diverging
-64%
104 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,089
A: 0 / B: 1089
Series A
Marsh (MRSH)
MRSH
Stock · 164 raw → 164 prepared
Series B
Ciena Corporation (CIEN)
CIEN
Stock · 1,253 raw → 1,253 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
8
Estimated crossover points between normalized spreads.
Slope
-1.1175
Linear regression slope.
Intercept
0.0019
Linear regression intercept.
Saved 4 months ago · ID: stock-cien_stock-mrsh_daily_5y