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Correlation
of % moves
-29%
In sync
of periods
42%
History
daysdays · through 2026-05-28
93
These move in the same direction about 42% of the time
Their swing sizes only faintly mirror each other (~9% 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
MRSH moves ~4 days before CIEN
Watch MRSH for an early read on CIEN.
Tighter in drawdowns
The relationship is stronger when both prices are falling than when both are rising — typical risk-off behaviour.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
42.4%
Headline metric
Movement correlation(i)
-29%
Based on % moves
95% CI
-47% → -9%
Likely range of correlation
Pipeline
Pipeline Summary
93 paired data points survived the daily window.
Raw input
93
1,254
Normalized
93
1,254
Prepared
93
1,254
Aligned
93
93
Invalid removed
R²(i)
8.5%
Variance explained
Significance
p < 0.01
Statistical confidence
Data points
93
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
+4 days
Correlation at this shift
-37%
+8% stronger than no-shift baseline
Ciena Corporation (CIEN) shifted 4 days earlier. Reads: "Does Marsh (MRSH) today line up with Ciena Corporation (CIEN) 4 days from now?"
88 overlapping points at this shift
Baseline
-29%
No-shift correlation, matching the main time-series chart above.
Peak shift
+4 days
-37%
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%
24 periods · Return correlation when both series rose
Both Falling
-53%
15 periods · Return correlation when both series fell
Diverging
-58%
53 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,161
A: 0 / B: 1161
Series A
Marsh (MRSH)
MRSH
Stock · 93 raw → 93 prepared
Series B
Ciena Corporation (CIEN)
CIEN
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
7
Estimated crossover points between normalized spreads.
Slope
-0.7382
Linear regression slope.
Intercept
0.0084
Linear regression intercept.
Saved 3 weeks ago · ID: stock-cien_stock-mrsh_daily_5y