<t>The reason it is universally accepted to use realized volatility from yesterday, today, is that squared returns exhibit quite strong autocorrelation. We therefore expect volatility to change rather slowly, hence justifying the use of historical data to obtain realized volatilities.But you point a...

Any possibility you could be a little more exact, i.e. I've searched the sites and cannot find the definition. Any chance anyone that knows could put in a link with a table. For example, a WARF of 2250... what letter (approx) does that correspond to?