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NZD/USD Exchange Rate vs State Street SPDR S&P 500 ETF Trust (SPY)
Correlation
of % moves
+26%
In sync
of periods
58%
History
daysdays · through 2026-05-15
1,237
These move in the same direction about 58% of the time
Their swing sizes only faintly line up (~7% of the pattern is shared).
A faint pattern — interesting as colour, not strong enough to act on alone.
Both lines start at the same point — easy to compare when growth rates are similar.
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)
58.0%
Headline metric
Movement correlation(i)
+26%
Based on % moves
95% CI
+21% → +31%
Likely range of correlation
Pipeline
Pipeline Summary
1,237 paired data points survived the daily window.
Raw input
13,869
1,253
Normalized
13,869
1,253
Prepared
13,869
1,253
Aligned
1,237
1,237
Invalid removed
R²(i)
6.9%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points
1,237
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
+26%
No shift — both series at their actual dates.
1,236 overlapping points at this shift
Baseline
+26%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+26%
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
+39%
46 periods · Return correlation when both series rose
Both Falling
+41%
51 periods · Return correlation when both series fell
Diverging
-58%
40 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
12,648
A: 12632 / B: 16
Series A
NZD/USD Exchange Rate
DEXUSNZ
FRED · 13,869 raw → 13,869 prepared
Series B
State Street SPDR S&P 500 ETF Trust (SPY)
SPY
Stock · 1,253 raw → 1,253 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
9
Estimated crossover points between normalized spreads.
Slope
0.4260
Linear regression slope.
Intercept
0.0005
Linear regression intercept.
Saved 4 days ago · ID: fred-dexusnz_stock-spy_daily_5y