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Correlation
of % moves
+30%
In sync
of periods
64%
History
daysdays · through 2026-07-09
644
These move in the same direction about 64% of the time
Their swing sizes only faintly line up (~9% of the pattern is shared).
A real but noisy link — useful as context, risky as a standalone signal.
Both lines start at the same point — easy to compare when growth rates are similar.
What to Watch
Unusual right now
Recently tighter than usual — the pair is behaving differently than its long-run pattern.
Decouples in drawdowns
The relationship weakens when both prices are falling — don't count on this pair as a hedge under stress.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
64%
Headline metric
Movement correlation(i)
+30%
Based on % moves
95% CI
N/A
Likely range
Pipeline
Pipeline Summary
644 paired data points survived the daily window.
Raw input
644
1,254
Normalized
644
1,254
Prepared
644
1,254
Aligned
644
644
Invalid removed
9%
Variance explained
Significance
N/A
Statistical confidence
Data points(i)
642
Robust
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
+30%
No shift — both series at their actual dates.
642 overlapping points at this shift
Baseline
+30%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+30%
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
+55%
85 periods · Return correlation when both series rose
Both Falling
+28%
86 periods · Return correlation when both series fell
Diverging
-55%
73 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
610
A: 0 / B: 610
Series A
Fiserv, Inc. Common Stock (FISV)
FISV
Stock · 644 raw → 644 prepared
Series B
West Pharmaceutical Services, Inc. (WST)
WST
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
14
Estimated crossover points between normalized spreads.
Slope
0.3427
Linear regression slope.
Intercept
0.0004
Linear regression intercept.
Saved 3 months ago · ID: stock-fisv_stock-wst_daily_5y