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Sandisk Corporation Common Stock (SNDK) vs iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX)
Correlation
of % moves
-45%
In sync
of periods
36%
History
daysdays · through 2026-09-08
387
These move in the same direction about 36% of the time
Their swing sizes loosely mirror each other (~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
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Mostly stable
The relationship drifts a little but stays in the same neighbourhood.
Advanced
Statistics
In sync(i)
36%
Headline metric
Movement correlation(i)
-45%
Based on % moves
95% CI
-52% → -36%
Likely range of correlation
Pipeline
Pipeline Summary
387 paired data points survived the daily window.
Raw input
387
1,253
Normalized
387
1,253
Prepared
387
1,253
Aligned
387
387
Invalid removed
R²(i)
20%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
386
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
-45%
No shift — both series at their actual dates.
386 overlapping points at this shift
Baseline
-45%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-45%
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
-20%
46 periods · Return correlation when both series rose
Both Falling
-20%
51 periods · Return correlation when both series fell
Diverging
-19%
152 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
866
A: 0 / B: 866
Series A
Sandisk Corporation Common Stock (SNDK)
SNDK
Stock · 387 raw → 387 prepared
Series B
iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX)
VXX
Stock · 1,253 raw → 1,253 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
5
Estimated crossover points between normalized spreads.
Slope
-0.2880
Linear regression slope.
Intercept
0.0003
Linear regression intercept.
Saved 4 months ago · ID: stock-sndk_stock-vxx_daily_5y