Market behavior
Return correlation matrix
Inspect how ETF daily returns moved together during a chosen historical window. The matrix reports measurements, not a synthetic portfolio score.
Use 2–8 funds. Values are Pearson correlations of date-aligned daily adjusted-close returns.
Pair summary · current 60-day window
Average pair correlation
N/A
Observed range
N/A
Available pairs
0 / 3
This is a description of the selected historical window, not a diversification score or forecast. Correlations can change sharply between market regimes.
Correlation matrix
Latest rolling-window observation for each pair.
| SPY | BND | EFA | |
|---|---|---|---|
| SPY | N/A | N/A | N/A |
| BND | N/A | N/A | N/A |
| EFA | N/A | N/A | N/A |
What is measured
Pearson correlation on daily percentage returns after matching observations by date. +1 means returns moved together, 0 means little linear relationship and −1 means opposite movement.
Window sensitivity
A 20-day result can differ materially from a 252-day result. Short windows react quickly; long windows blend several market regimes.
Important limit
Low historical correlation does not guarantee lower future risk. Pairwise correlation also ignores position sizes; use Portfolio X-Ray alongside this matrix.