Loading market view
Loading market view
Loading correlations
Accuray Incorporated (ARAY) vs PPI: All Commodities
Correlation
of % moves
-29%
In sync
of periods
42%
History
monthsmonths · through 2026-08
60
These move in the same direction about 42% of the time
Their swing sizes only faintly mirror each other (~8% of the pattern is shared).
A faint pattern — interesting as colour, not strong enough to act on alone.
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
ARAY moves ~7 months before PPI: All Commodities
Watch ARAY for an early read on PPI: All Commodities.
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
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)
42%
Headline metric
Movement correlation(i)
-29%
Based on % moves
95% CI
-51% → -3%
Likely range of correlation
Pipeline
Pipeline Summary
60 paired data points survived the monthly window.
Raw input
1,253
1,364
Normalized
1,253
1,364
Prepared
61
1,364
Aligned
60
60
Invalid removed
R²(i)
8%
Variance explained
Significance
p < 0.05
Statistical confidence
Data points(i)
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
+7 months
Correlation at this shift
+43%
+14% stronger than no-shift baseline
PPI: All Commodities shifted 7 months earlier. Reads: "Does Accuray Incorporated (ARAY) today line up with PPI: All Commodities 7 months from now?"
52 overlapping points at this shift
Baseline
-29%
No-shift correlation, matching the main time-series chart above.
Peak shift
+7 months
+43%
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
+33%
13 periods · Return correlation when both series rose
Both Falling
-25%
12 periods · Return correlation when both series fell
Diverging
-63%
34 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,305
A: 1 / B: 1304
Series A
Accuray Incorporated (ARAY)
ARAY
Stock · 1,253 raw → 61 prepared
Series B
PPI: All Commodities
PPIACO
FRED · 1,364 raw → 1,364 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
3
Estimated crossover points between normalized spreads.
Slope
-0.0258
Linear regression slope.
Intercept
0.0023
Linear regression intercept.
Saved 4 months ago · ID: fred-ppiaco_stock-aray_monthly_5y