Reading the matrix: the alphabet of the map
A correlation matrix is not a table, it is the hidden wiring diagram of your portfolio. Learning to read it takes five minutes.
#Your portfolio's wiring diagram
A correlation matrix shows, in one table, the tendency of every pair of assets in your portfolio to move together. Once you learn to read it, you answer "am I diversified?" not by guessing but by looking.
#The alphabet
In the matrix, each cell is the relationship between two assets:
- The diagonal (an asset with itself) is always +1 - it carries no information and is ignored.
- It is symmetric: cell A-B equals cell B-A. So reading half of it is enough.
- The value range is between -1 and +1.
A reading guide:
| Value band | Meaning |
|---|---|
| +0.8 and above | Almost the same asset. No diversification. |
| +0.5 to +0.8 | Strong co-movement. Likely tied to the same driver. |
| +0.2 to +0.5 | Moderate link. Partial diversification. |
| -0.2 to +0.2 | Practically independent. Good diversification. |
| below -0.2 | Opposite tendency. A natural balancer. |
These bands are not sharp rules, they are a reading aid. As you will see in the next lesson, tying a sharp decision to a single number is a mistake.
#A representative example
The table below is entirely representative - not the real correlations of real assets, only for reading practice:
| A | B | C | D | |
|---|---|---|---|---|
| A | 1.00 | 0.87 | 0.12 | -0.25 |
| B | 0.87 | 1.00 | 0.15 | -0.20 |
| C | 0.12 | 0.15 | 1.00 | 0.05 |
| D | -0.25 | -0.20 | 0.05 | 1.00 |
What do you see in this table?
- A and B are almost the same asset (0.87). Two rows in the portfolio but one risk.
- C is independent of both (0.12 / 0.15). A real diversifier.
- D tends opposite (-0.25 / -0.20). A balancer.
#Reading it as a heatmap
Looking at color intensity instead of numbers (a heatmap) lets you catch the pattern faster: dark blocks show clusters that move together. Alvest's Correlation Analysis produces this view automatically for your portfolio.
What your eye should search for is not individual numbers, but dark blocks.
Yorumlar 0