Jumping back in the pool(ing): testing pooling by asset class and portfolio weight distance

This is post #10 in my 2026 series on portfolio optimisation. Time for a quick recap. I'm not going to revisit every post but instead summarise what I now think one should be doing when optimising forecast weights before costs (I haven't yet incorporated costs, nor thought about instrument weights). Pool all instrument returns together At a minimum use a 40 year EWM for SR estimates (and…