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Correlation
of % moves
-47%
In sync
of periods
29%
History
daysdays · through 2026-09-04
162
These move in the same direction about 29% of the time
Their swing sizes loosely mirror each other (~22% of the pattern is shared).
Strong enough to use as a signal — check the stability and regime notes below before relying on it.
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)
29%
Headline metric
Movement correlation(i)
-47%
Based on % moves
95% CI
-58% → -34%
Likely range of correlation
Pipeline
Pipeline Summary
162 paired data points survived the daily window.
Raw input
1,254
162
Normalized
1,254
162
Prepared
1,254
162
Aligned
162
162
Invalid removed
R²(i)
22%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
161
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
-47%
No shift — both series at their actual dates.
161 overlapping points at this shift
Baseline
-47%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-47%
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
-1%
28 periods · Return correlation when both series rose
Both Falling
-19%
18 periods · Return correlation when both series fell
Diverging
-63%
115 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,092
A: 1092 / B: 0
Series A
Western Digital Corp. (WDC)
WDC
Stock · 1,254 raw → 1,254 prepared
Series B
Marsh (MRSH)
MRSH
Stock · 162 raw → 162 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
5
Estimated crossover points between normalized spreads.
Slope
-0.1567
Linear regression slope.
Intercept
0.0008
Linear regression intercept.
Saved 4 months ago · ID: stock-mrsh_stock-wdc_daily_5y