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Correlation
of values
+73%
In sync
of periods
61%
History
monthsmonths · through 2026-05
58
These move in the same direction about 61% of the time
When one swings, the other often swings by a similar amount (~53% 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.
Interest on Reserve Balances moves ~18 months before US CPI
Watch Interest on Reserve Balances for an early read on US CPI.
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)
+73%
Based on values
95% CI
N/A
Pipeline
Pipeline Summary
58 paired data points survived the monthly window.
Raw input
952
1,806
Normalized
952
1,806
Prepared
952
61
Aligned
58
58
Invalid removed
Likely range
R²(i)
53%
Variance explained
Significance
N/A
Statistical confidence
Data points(i)
58
Thin
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
-18 months
Correlation at this shift
+95%
+22% stronger than no-shift baseline
Interest on Reserve Balances shifted 18 months later. Reads: "Does US CPI today line up with Interest on Reserve Balances 18 months ago?"
33 overlapping points at this shift
Baseline
+73%
No-shift correlation, matching the main time-series chart above.
Peak shift
-18 months
+95%
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
-9%
22 periods · Return correlation when both series rose
Both Falling
N/A
0 periods · Return correlation when both series fell
Diverging
-22%
34 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
897
A: 894 / B: 3
Series A
US CPI
CPIAUCSL
FRED · 952 raw → 952 prepared
Series B
Interest on Reserve Balances
IORB
FRED · 1,806 raw → 61 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
1
Estimated crossover points between normalized spreads.
Slope
0.0853
Linear regression slope.
Intercept
-22.5093
Linear regression intercept.
Saved 3 months ago · ID: fred-cpiaucsl_fred-iorb_monthly_5y