Monthly Archives: May 2014

Calculating Standard Deviations in Ruby on Rails (and PostgreSQL)

I need to calculate some Bollinger Bands (BBs) for SwingTradeBot, which is built in Rails 4. Here’s a quick definition of Bollinger Bands: Bollinger BandsĀ® are volatility bands placed above and below a moving average. Volatility is based on the … Continue reading

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