There is a bearish candle pattern called 'Upside Gap-Two Crows' that Steve Nison describes as being very rare on p.95 of his book 'Japanese Candlestick Charting Techniques', 2nd Edition. The pattern looks like this:
Having a look at 10% of the Quantopian data over (almost) 12 years shows 920 occurences so it occurs approximately once in every 14 years per stock. Does anyone want to write an algo using it?
P.
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