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Natera, Inc. Common Stock (NTRA) vs PPI: All Commodities
Correlation
of % moves
-37%
In sync
of periods
48%
History
monthsmonths · through 2026-04
59
These move in the same direction about 48% of the time
Their swing sizes only faintly mirror each other (~14% of the pattern is shared).
Roughly random — these don't track each other in a meaningful way.
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
Decouples in drawdowns
The relationship weakens when both prices are falling — don't count on this pair as a hedge under stress.
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)
48.3%
Headline metric
Movement correlation(i)
-37%
Based on % moves
95% CI
-58% → -13%
Likely range of correlation
Pipeline
Pipeline Summary
59 paired data points survived the monthly window.
Raw input
1,254
1,360
Normalized
1,254
1,360
Prepared
60
1,360
Aligned
59
59
Invalid removed
R²(i)
14.0%
Variance explained
Significance
p < 0.01
Statistical confidence
Data points
59
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
No shift
Correlation at this shift
-37%
No shift — both series at their actual dates.
58 overlapping points at this shift
Baseline
-37%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-37%
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
-41%
19 periods · Return correlation when both series rose
Both Falling
-5%
9 periods · Return correlation when both series fell
Diverging
-73%
30 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,302
A: 1 / B: 1301
Series A
Natera, Inc. Common Stock (NTRA)
NTRA
Stock · 1,254 raw → 60 prepared
Series B
PPI: All Commodities
PPIACO
FRED · 1,360 raw → 1,360 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
2
Estimated crossover points between normalized spreads.
Slope
-0.0394
Linear regression slope.
Intercept
0.0042
Linear regression intercept.
Saved 3 weeks ago · ID: fred-ppiaco_stock-ntra_monthly_5y