I am trying to use Bollinger Bands as a factor in my pipeline. It's a built-in factor, but not much is said about it in the docs, or any of the factors really, just that it exists and it has some paramaters that are such and such. I have to know what kind of data it returns. I know what Bollinger Bands are, but I can't understand how it could return data to put into a single pipline column. Could someone let me know how quantopian implements Bollinger Bands as a factor? I specifically want to use it to find breakouts.
You can use it like below to have the bands in your pipeline output:
# k : float: The number of standard deviations to add or subtract to create the
# upper and lower bands.
lower, middle, upper = BollingerBands(mask=my_universe, window_length=22, k=1.)
pipe.add(lower, 'lower')
pipe.add(middle, 'middle')
pipe.add(upper, 'upper')
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