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How to Calculate Minimum value of Dollar Volume and Volume

Hello!

I'm new to Quantopian.

I've read articles (especially in the help section) on how to calculate technical indicators in Quantopian but I haven't seen references on calculating the lowest or highest value of prices or volume for a lookback period.

How can I implement in Quantopian the minimum value of Dollar Volume of stocks over a lookback period?

Thanks a lot!