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How to test a specific signal on multiple stocks

Hi all,
I am new to Quantopian and I have a question
How can I test a signal on multiple stocks and see the overall statistics ?
For example, if I want to test SMA_20 cross SMA_50 momentum strategy on Q1500 and see the overall result and general performance from 2003-2017 on 1500 stocks. How to start my code ? any reference material I can study ?

Thanks !