Backtesting help!

From: Raj
Sent on: Wednesday, October 17, 2012 9:54 AM

Does anyone have experience using Think or Swim (TD Ameritrade) or other free sources to backtest strategies?  I’m interested in backtesting Options strategies and TD Ameritrade has the data.  However, I’m unable to figure out how to download the data for multiple timeframes so I can manipulate in Excel. 


Appreciate pointers to other free sources as well. 






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