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Correlation
of % moves
-45%
In sync
of periods
32%
History
daysdays · through 2026-09-10
165
These move in the same direction about 32% of the time
Their swing sizes loosely mirror each other (~20% 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
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.
Swings around
Their relationship swings around — sometimes tight, sometimes loose. Don't trust a single snapshot.
Advanced
Statistics
In sync(i)
32%
Headline metric
Movement correlation(i)
-45%
Based on % moves
95% CI
-56% → -32%
Likely range of correlation
Pipeline
Pipeline Summary
165 paired data points survived the daily window.
Raw input
165
1,254
Normalized
165
1,254
Prepared
165
1,254
Aligned
165
165
Invalid removed
R²(i)
20%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
164
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
-45%
No shift — both series at their actual dates.
164 overlapping points at this shift
Baseline
-45%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-45%
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
-11%
32 periods · Return correlation when both series rose
Both Falling
-17%
20 periods · Return correlation when both series fell
Diverging
-66%
112 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 · 165 raw → 165 prepared
Series B
Teradyne, Inc. Common Stock (TER)
TER
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
15
Estimated crossover points between normalized spreads.
Slope
-1.3282
Linear regression slope.
Intercept
0.0026
Linear regression intercept.
Saved 4 months ago · ID: stock-mrsh_stock-ter_daily_5y