Diversification Isn't What It Used to Be [View article]
It is not clear that the correlations are changing rather than simply your estimates of the correlations. You're changing the data set. One would be shocked not to see the sample correlations estimates change.
Why the Cheapest ETFs Aren't Necessarily the Best [View article]
It is very difficult to hedge or leverage BND.
Diversification Isn't What It Used to Be [View article]
You might be right, but it is not obvious.
Your data sets are very small ...
- A time series statistician.