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Reddit, Inc. (RDDT) vs CPI: Used Cars & Trucks
Correlation
of % moves
+37%
In sync
of periods
60%
History
monthsmonths · through 2026-04
26
These move in the same direction about 60% of the time
Their swing sizes only faintly line up (~14% 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
Slipping looser
The recent pattern is looser than its long-run baseline — keep an eye on whether this sticks.
CPI: Used Cars & Trucks moves ~13 months before RDDT
Watch CPI: Used Cars & Trucks for an early read on RDDT.
Tighter in drawdowns
The relationship is stronger when both prices are falling than when both are rising — typical risk-off behaviour.
Flips between sync and inverse
Sometimes the two move together, sometimes opposite. Don't treat this as a stable signal.
Advanced
Statistics
In sync(i)
60.0%
Headline metric
Movement correlation(i)
+37%
Based on % moves
95% CI
-3% → +67%
Likely range of correlation
Pipeline
Pipeline Summary
26 paired data points survived the monthly window.
Raw input
545
880
Normalized
545
880
Prepared
27
880
Aligned
26
26
Invalid removed
R²(i)
13.6%
Variance explained
Significance
n.s.
Statistical confidence
Data points
26
Limited
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: -15 to 15 months.
Selected shift
-13 months
Correlation at this shift
-72%
+35% stronger than no-shift baseline
CPI: Used Cars & Trucks shifted 13 months later. Reads: "Does Reddit, Inc. (RDDT) today line up with CPI: Used Cars & Trucks 13 months ago?"
12 overlapping points at this shift
Baseline
+37%
No-shift correlation, matching the main time-series chart above.
Peak shift
-13 months
-72%
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
+1%
8 periods · Return correlation when both series rose
Both Falling
-50%
7 periods · Return correlation when both series fell
Diverging
-54%
10 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
855
A: 1 / B: 854
Series A
Reddit, Inc. (RDDT)
RDDT
Stock · 545 raw → 27 prepared
Series B
CPI: Used Cars & Trucks
CUSR0000SETA02
FRED · 880 raw → 880 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
3
Estimated crossover points between normalized spreads.
Slope
0.0156
Linear regression slope.
Intercept
-0.0017
Linear regression intercept.
Saved 2 weeks ago · ID: fred-cusr0000seta02_stock-rddt_monthly_5y