Quote from sle:
how is that? event is 1 business day and everything else ambient vol.
Dude, it's very simple - you take ATM volatility for two expirations, say e1 and e2. This gives you a system of linear equations:Quote from lcs:
Compared to 5D expiry, 1M vols breakdown between event and ambient should place more weight on events vols rather than 1:19 (assuming 20BD). Maybe 2:18, ..., 5:15, ...? depending on the events within the 1M period. Likewise for 2M vs 1M.
Am I misinterpreting something here? thanks.

Quote from sle:
Dude, it's very simple - you take ATM volatility for two expirations, say e1 and e2. This gives you a system of linear equations:
vol(e1)^2 * BD(e1)/252 = ambient_vol^2 * (BD(e1)-1)/252 + event_vol^2 * 1/252
vol(e2)^2 * BD(e2)/252 = ambient_vol^2 * (BD(e2)-1)/252 + event_vol^2 * 1/252
I trust you can solve a system of linear equations?![]()