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Is it possible to import your own signals from Excel and then backtest with Quantopian?

Hi everybody - just joined the community - hope you are all well.

Have searched through the forums but have not been able to find a definitive answer to this question:

Is it possible to import your own signals from Excel and then backtest with Quantopian?

Say I am using a portfolio of max 25 instruments, my signals are currently generated in Excel on a daily timeframe, outputs are 1 = long, -1 = short, with a simple target based on ATR or stop loss also based on ATR which closes the position. Multiple positions can be open at one time, the main constraining factor is the capital available.

If so what would an example of output format that would be required to import into Quantopian?

Thanks in advance for any guidance