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Correlation
of % moves
+21%
In sync
of periods
55%
History
daysdays · through 2026-06-11
121
These move in the same direction about 55% of the time
Their swing sizes only faintly line up (~4% of the pattern is shared).
A faint pattern — interesting as colour, not strong enough to act on alone.
Both lines start at the same point — easy to compare when growth rates are similar.
What to Watch
Slipping tighter
The recent pattern is tighter 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.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
55.0%
Headline metric
Movement correlation(i)
+21%
Based on % moves
95% CI
+3% → +37%
Likely range of correlation
Pipeline
Pipeline Summary
121 paired data points survived the daily window.
Raw input
121
1,255
Normalized
121
1,255
Prepared
121
1,255
Aligned
121
121
Invalid removed
R²(i)
4.3%
Variance explained
Significance
p < 0.05
Statistical confidence
Data points
121
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
+21%
No shift — both series at their actual dates.
120 overlapping points at this shift
Baseline
+21%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+21%
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%
31 periods · Return correlation when both series rose
Both Falling
-1%
35 periods · Return correlation when both series fell
Diverging
-37%
54 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,134
A: 0 / B: 1134
Series A
Medline Inc. Class A common stock (MDLN)
MDLN
Stock · 121 raw → 121 prepared
Series B
Waters Corp (WAT)
WAT
Stock · 1,255 raw → 1,255 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
4
Estimated crossover points between normalized spreads.
Slope
0.2077
Linear regression slope.
Intercept
-0.0002
Linear regression intercept.
Saved last month · ID: stock-mdln_stock-wat_daily_5y