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USD/TWD Exchange Rate vs State Street SPDR S&P 500 ETF Trust (SPY)
Correlation
of % moves
-14%
In sync
of periods
44%
History
daysdays · through 2026-05-15
1,237
These move in the same direction about 44% of the time
Their swing sizes only faintly mirror each other (~2% 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)
43.7%
Headline metric
Movement correlation(i)
-14%
Based on % moves
95% CI
-20% → -9%
Likely range of correlation
Pipeline
Pipeline Summary
1,237 paired data points survived the daily window.
Raw input
10,398
1,253
Normalized
10,398
1,253
Prepared
10,398
1,253
Aligned
1,237
1,237
Invalid removed
R²(i)
2.1%
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
-14%
No shift — both series at their actual dates.
1,236 overlapping points at this shift
Baseline
-14%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-14%
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%
34 periods · Return correlation when both series rose
Both Falling
-7%
16 periods · Return correlation when both series fell
Diverging
-69%
89 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
9,177
A: 9161 / B: 16
Series A
USD/TWD Exchange Rate
DEXTAUS
FRED · 10,398 raw → 10,398 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
-0.4757
Linear regression slope.
Intercept
0.0005
Linear regression intercept.
Saved 4 days ago · ID: fred-dextaus_stock-spy_daily_5y