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Reddit, Inc. (RDDT) vs CPI: Used Cars & Trucks
Correlation
of % moves
+37%
In sync
of periods
61%
History
monthsmonths · through 2026-07
29
These move in the same direction about 61% 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
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)
61%
Headline metric
Movement correlation(i)
+37%
Based on % moves
95% CI
-1% → +65%
Likely range of correlation
Pipeline
Pipeline Summary
29 paired data points survived the monthly window.
Raw input
617
883
Normalized
617
883
Prepared
31
883
Aligned
29
29
Invalid removed
R²(i)
14%
Variance explained
Significance
n.s.
Statistical confidence
Data points(i)
28
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: -18 to 18 months.
Selected shift
-13 months
Correlation at this shift
-71%
+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?"
15 overlapping points at this shift
Baseline
+37%
No-shift correlation, matching the main time-series chart above.
Peak shift
-13 months
-71%
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
+25%
10 periods · Return correlation when both series rose
Both Falling
-50%
7 periods · Return correlation when both series fell
Diverging
-52%
11 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
856
A: 2 / B: 854
Series A
Reddit, Inc. (RDDT)
RDDT
Stock · 617 raw → 31 prepared
Series B
CPI: Used Cars & Trucks
CUSR0000SETA02
FRED · 883 raw → 883 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
3
Estimated crossover points between normalized spreads.
Slope
0.0157
Linear regression slope.
Intercept
-0.0015
Linear regression intercept.
Saved 4 months ago · ID: fred-cusr0000seta02_stock-rddt_monthly_5y