When trying to go long and short on the same security using this syntax my position is zero. Is it because am buy then selling as pose to buy 50% long and shorting 50%
order_target_percent(context.spy, .50)
order_target_percent(context.spy, -.50) i don't think you can, and doing so doesn't make sense anyways. the definition of selling short is to sell without actually owning the security
You can do that using LIMIT orders. Put a limit order to buy at lower threshold and a limit order to sell at higher threshold. This is typically used by institutions to trade "brackets" of volatile stocks during opening or closing hours when there is a liquidity premium to be captured if they believe that prices will mean revert. Anyway more on brackets later.
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