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Correlation
of % moves
+85%
In sync
of periods
81%
History
daysdays · through 2026-09-09
1,253
These move in the same direction about 81% of the time
When one swings, the other almost always swings by a closely matched amount (~72% of the pattern is shared).
Strong enough to use as a signal — check the stability and regime notes below before relying on it.
Both lines start at the same point — easy to compare when growth rates are similar.
What to Watch
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Advanced
Statistics
In sync(i)
81%
Headline metric
Movement correlation(i)
+85%
Based on % moves
95% CI
+83% → +87%
Likely range of correlation
Pipeline
Pipeline Summary
1,253 paired data points survived the daily window.
Raw input
1,253
1,253
Normalized
1,253
1,253
Prepared
1,253
1,253
Aligned
1,253
1,253
Invalid removed
R²(i)
72%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
1,252
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
+85%
No shift — both series at their actual dates.
1,252 overlapping points at this shift
Baseline
+85%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+85%
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
+70%
72 periods · Return correlation when both series rose
Both Falling
+85%
65 periods · Return correlation when both series fell
Diverging
-43%
11 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
0
A: 0 / B: 0
Series A
IWM
Stock · 1,253 raw → 1,253 prepared
Series B
State Street SPDR S&P 500 ETF Trust (SPY)
SPY
Stock · 1,253 raw → 1,253 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
9
Estimated crossover points between normalized spreads.
Slope
0.6521
Linear regression slope.
Intercept
0.0003
Linear regression intercept.
Saved 2 weeks ago · ID: stock-iwm-vs-stock-spy-daily