We recently published a performance review of at-the-money (ATM) NDX straddles with between one and five days left to expiration. One finding was that consistent sellers of 3-Day, 4-Day, and 5-Day NDX ...
Recently, we published a study exploring the behavior of short-dated straddles using Nasdaq-100 (NDX) options. That write up may be found here A Deep Dive Into Short Dated at-the-Money NDX Straddles.