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Boston Scientific Corp. (BSX) vs NASDAQ Composite
Correlation
of % moves
+40%
In sync
of periods
61%
History
daysdays · through 2026-05-21
1,253
These move in the same direction about 61% of the time
Their swing sizes loosely line up (~16% 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
Tighter in drawdowns
The relationship is stronger when both prices are falling than when both are rising — typical risk-off behaviour.
Mostly stable
The relationship drifts a little but stays in the same neighbourhood.
Advanced
Statistics
In sync(i)
61.0%
Headline metric
Movement correlation(i)
+40%
Based on % moves
95% CI
+35% → +45%
Likely range of correlation
Pipeline
Pipeline Summary
1,253 paired data points survived the daily window.
Raw input
1,254
13,941
Normalized
1,254
13,941
Prepared
1,254
13,941
Aligned
1,253
1,253
Invalid removed
R²(i)
16.1%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points
1,253
Deep
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
+40%
No shift — both series at their actual dates.
1,252 overlapping points at this shift
Baseline
+40%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+40%
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
+27%
97 periods · Return correlation when both series rose
Both Falling
+63%
71 periods · Return correlation when both series fell
Diverging
-58%
81 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
12,689
A: 1 / B: 12688
Series A
Boston Scientific Corp. (BSX)
BSX
Stock · 1,254 raw → 1,254 prepared
Series B
NASDAQ Composite
NASDAQCOM
FRED · 13,941 raw → 13,941 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
23
Estimated crossover points between normalized spreads.
Slope
0.3547
Linear regression slope.
Intercept
0.0004
Linear regression intercept.
Saved 2 weeks ago · ID: fred-nasdaqcom_stock-bsx_daily_5y