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9
votes
2answers
1k views

How to simulate slippage

I'm backtesting a trading strategy, using free OHLC data from yahoo or google. I'm simulating friction by lopping a flat percentage (say 0.5%) off my returns for each day that I make a trade. Whats ...
5
votes
3answers
296 views

Maximum friction-free trades

I have a trading system I would like to test for the S&P 500, or another very similar instrument. I'm looking to make approximately 10-15 trades per month. I know if you have a Vanguard account, ...