K
krugman25
The person who posted this study provided an update. See belowThis is research done by someone in a different trading group I am a part of. This person primarily trades IWM. This was research on overnight gap down risk. Somewhat related to what we are talking about here.
"Here's a pretty interesting study on overnight gaps down in IWM over the past 20 years that I thought I'd share. I wanted to see what the actual number of occurrences was for an overnight gap down of 2% or greater in IWM (and essentially RUT), since I sell puts on that each week. I use stop loss orders but in the event of a large gap down, the stop loss will not protect me. I downloaded intraday data from Yahoo Finance, and added a column that would calculate the % change from the opening price of the day compared to the closing price of the prior day. Summary - there is around a 1.2% risk of an overnight gap down of 2% or greater."
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"It was just pointed out to me that I should remove the totals in the chart I posted because the 5% move is included in the moves >2%, and >3%, etc. So the occurrence of a 2% move or greater over the past 20 years was 0.8 percent, and in my backtest over the past 7.5 years it was 0.3 percent. That reduces the probabilities even more of an overnight gap down."
