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iShares Gold Trust (IAU) vs US Dollar Index
Correlation
of % moves
-39%
In sync
of periods
35%
History
daysdays · through 2026-07-02
1,239
These move in the same direction about 35% of the time
Their swing sizes only faintly mirror each other (~15% of the pattern is shared).
Strong enough to use as a signal — check the stability and regime notes below before relying on it.
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
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Advanced
Statistics
In sync(i)
35%
Headline metric
Movement correlation(i)
-39%
Based on % moves
95% CI
N/A
Likely range
Pipeline
Pipeline Summary
1,239 paired data points survived the daily window.
Raw input
1,254
5,139
Normalized
1,254
5,139
Prepared
1,254
5,139
Aligned
1,239
1,239
Invalid removed
15%
Variance explained
Significance
N/A
Statistical confidence
Data points(i)
1,238
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
-39%
No shift — both series at their actual dates.
1,238 overlapping points at this shift
Baseline
-39%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-39%
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
-22%
39 periods · Return correlation when both series rose
Both Falling
-12%
38 periods · Return correlation when both series fell
Diverging
-32%
71 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
3,915
A: 15 / B: 3900
Series A
iShares Gold Trust (IAU)
IAU
Stock · 1,254 raw → 1,254 prepared
Series B
US Dollar Index
DTWEXAFEGS
FRED · 5,139 raw → 5,139 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
9
Estimated crossover points between normalized spreads.
Slope
-0.1353
Linear regression slope.
Intercept
0.0002
Linear regression intercept.
Saved 3 months ago · ID: fred-dtwexafegs_stock-iau_daily_5y