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Correlation
of % moves
+39%
In sync
of periods
61%
History
daysdays · through 2026-08-11
368
These move in the same direction about 61% of the time
Their swing sizes only faintly line up (~15% 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)
61%
Headline metric
Movement correlation(i)
+39%
Based on % moves
95% CI
+30% → +47%
Likely range of correlation
Pipeline
Pipeline Summary
368 paired data points survived the daily window.
Raw input
368
1,253
Normalized
368
1,253
Prepared
368
1,253
Aligned
368
368
Invalid removed
R²(i)
15%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
367
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
+39%
No shift — both series at their actual dates.
367 overlapping points at this shift
Baseline
+39%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+39%
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
+22%
93 periods · Return correlation when both series rose
Both Falling
+38%
70 periods · Return correlation when both series fell
Diverging
-36%
86 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
885
A: 0 / B: 885
Series A
Sandisk Corporation Common Stock (SNDK)
SNDK
Stock · 368 raw → 368 prepared
Series B
PROTO LABS, INC. (PRLB)
PRLB
Stock · 1,253 raw → 1,253 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
1
Estimated crossover points between normalized spreads.
Slope
0.1637
Linear regression slope.
Intercept
0.0008
Linear regression intercept.
Saved 3 months ago · ID: stock-prlb_stock-sndk_daily_5y