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Correlation
of % moves
+81%
In sync
of periods
81%
History
daysdays · through 2026-05-11
1,255
These move in the same direction about 81% of the time
When one swings, the other often swings by a similar amount (~65% 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
Unusual right now
Recently tighter than usual — the pair is behaving differently than its long-run pattern.
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
81.3%
Headline metric
Movement correlation(i)
+81%
Based on % moves
95% CI
+78% → +82%
Likely range of correlation
Pipeline
Pipeline Summary
1,255 paired data points survived the daily window.
Raw input
1,255
1,255
Normalized
1,255
1,255
Prepared
1,255
1,255
Aligned
1,255
1,255
Invalid removed
R²(i)
64.8%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points
1,255
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
+81%
No shift — both series at their actual dates.
1,254 overlapping points at this shift
Baseline
+81%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+81%
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
+72%
118 periods · Return correlation when both series rose
Both Falling
+81%
106 periods · Return correlation when both series fell
Diverging
-54%
25 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
AEP
Stock · 1,255 raw → 1,255 prepared
Series B
CMS
Stock · 1,255 raw → 1,255 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
51
Estimated crossover points between normalized spreads.
Slope
0.7654
Linear regression slope.
Intercept
-0.0001
Linear regression intercept.
Saved 2 days ago · ID: stock-aep_stock-cms_daily_5y