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Correlation
of % moves
+44%
In sync
of periods
62%
History
daysdays · through 2026-09-04
386
These move in the same direction about 62% of the time
Their swing sizes loosely line up (~20% of the pattern is shared).
A real but noisy link — useful as context, risky as a standalone signal.
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
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)
62%
Headline metric
Movement correlation(i)
+44%
Based on % moves
95% CI
+36% → +52%
Likely range of correlation
Pipeline
Pipeline Summary
386 paired data points survived the daily window.
Raw input
386
1,253
Normalized
386
1,253
Prepared
386
1,253
Aligned
386
386
Invalid removed
R²(i)
20%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
385
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
+44%
No shift — both series at their actual dates.
385 overlapping points at this shift
Baseline
+44%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+44%
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
+51%
100 periods · Return correlation when both series rose
Both Falling
+28%
70 periods · Return correlation when both series fell
Diverging
-41%
79 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
867
A: 0 / B: 867
Series A
Sandisk Corporation Common Stock (SNDK)
SNDK
Stock · 386 raw → 386 prepared
Series B
Global X Copper Miners ETF (NEW) (COPX)
COPX
Stock · 1,253 raw → 1,253 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
7
Estimated crossover points between normalized spreads.
Slope
0.1880
Linear regression slope.
Intercept
0.0004
Linear regression intercept.
Saved 4 months ago · ID: stock-copx_stock-sndk_daily_5y