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Correlation
of % moves
+44%
In sync
of periods
65%
History
daysdays · through 2026-05-22
545
These move in the same direction about 65% of the time
Their swing sizes loosely line up (~19% of the pattern is shared).
A real but noisy link — useful as context, risky as a standalone signal.
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.
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)
64.8%
Headline metric
Movement correlation(i)
+44%
Based on % moves
95% CI
+36% → +50%
Likely range of correlation
Pipeline
Pipeline Summary
545 paired data points survived the daily window.
Raw input
545
1,254
Normalized
545
1,254
Prepared
545
1,254
Aligned
545
545
Invalid removed
R²(i)
19.0%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points
545
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
+44%
No shift — both series at their actual dates.
544 overlapping points at this shift
Baseline
+44%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+44%
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
+33%
100 periods · Return correlation when both series rose
Both Falling
+57%
92 periods · Return correlation when both series fell
Diverging
-27%
57 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
709
A: 0 / B: 709
Series A
Reddit, Inc. (RDDT)
RDDT
Stock · 545 raw → 545 prepared
Series B
Affirm Holdings, Inc. Class A Common Stock (AFRM)
AFRM
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
18
Estimated crossover points between normalized spreads.
Slope
0.4009
Linear regression slope.
Intercept
0.0003
Linear regression intercept.
Saved 2 weeks ago · ID: stock-afrm_stock-rddt_daily_5y