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Best way is exspect up gaps above 200dma, ETFs; gaps down in bear. That can work in stocks, but earnings can goof them down more. NEVER have noticed many or any/patterns in irregular hours, but a huge herd of elephants, in post market is bullish.,
BUYing a gap up this late in the year, no thanks; but below 50 dma,[close below 50 dma] may sell it/MAY. I never believed the nonsense '' sell in MAY/HEY/+stay away ''.Quitters never win;prefer a stay- cation as Dave Ramsey says, rather than a vacation this year.
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That+ plenty of discretion.And once it gets or gaps below 200 day moving average =most likely going down more.[ NOT a prediction. I saw a good IBD chart; one can buy the 52 week HIGH/SPY, for 40 years + most likely still make a fortune if that is done about 40 years.],