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Correlation
of % moves
+68%
In sync
of periods
70%
History
daysdays · through 2026-07-09
345
These move in the same direction about 70% of the time
When one swings, the other often swings by a similar amount (~46% 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
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)
70%
Headline metric
Movement correlation(i)
+68%
Based on % moves
95% CI
N/A
Likely range
Pipeline
Pipeline Summary
345 paired data points survived the daily window.
Raw input
345
1,254
Normalized
345
1,254
Prepared
345
1,254
Aligned
345
345
Invalid removed
46%
Variance explained
Significance
N/A
Statistical confidence
Data points(i)
344
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
+68%
No shift — both series at their actual dates.
344 overlapping points at this shift
Baseline
+68%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+68%
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
+61%
121 periods · Return correlation when both series rose
Both Falling
+89%
71 periods · Return correlation when both series fell
Diverging
-64%
57 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
909
A: 0 / B: 909
Series A
Sandisk Corporation Common Stock (SNDK)
SNDK
Stock · 345 raw → 345 prepared
Series B
Western Digital Corp. (WDC)
WDC
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
3
Estimated crossover points between normalized spreads.
Slope
0.4673
Linear regression slope.
Intercept
0.0022
Linear regression intercept.
Saved 3 months ago · ID: stock-sndk_stock-wdc_daily_5y