Correlation Guides
Practical, no-fluff guides to correlation and diversification for ETF investors — what the Pearson coefficient means, why it drives diversification, and how to read a correlation matrix. Free to read, and every guide links straight into the tool so you can try as you learn.
What is the Pearson correlation coefficient?
A plain-English explanation of the Pearson correlation coefficient (r): the formula, what the number means from −1 to +1, and how investors use it to compare ETFs.
ETF correlation and diversification
How correlation drives real diversification. Why holding many ETFs that all move together isn't diversified, and how to use correlation to build a steadier China ETF portfolio.
How to read a correlation matrix
A correlation matrix shows every pairwise correlation in a basket at once. Learn to read the grid and color heatmap, and what to look for when comparing China ETFs.