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Backtest getting better fills at higher initial capital

I am trying to figure out why, using the default slippage model, I am getting better fills (lower buys and higher sells) with $10,000 vs. $1,000 starting capital. I can't think of a single reason why this would be.

Here's a screenshot.

https://drive.google.com/file/d/0B04djZ8V64_7UzE3NVlSTFJYZW8/view?usp=sharing

Any comments would be much appreciated.

7 responses

is that backtest with pro?

Pro?

Great Arbitrage Opportunity. Buy 160 shares of that ticker and simultaneously sell 16 shares 10 times ;)

commission.

I double checked and the commision per share was set to zero.

yeah. but was is the commission per order? the math works out close enough that it's probably not coincidence.

toan tran , thanks for clearing this up! I was under the impression that set_commission(commission.PerShare(cost=0)) meant that there were absolutely no commissions charged.