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I am trying to backtest a strategy of 9/20 ema crossing (buying or shorting on the crossover) and am having a little issue. My code will initiate the initial buy when I want it to but it won’t sell out and rebuy when the criteria is met. Any thoughts? I am newish to coding but here is my code: (*Note: on the sell command, I have two duplicate lines of the order to create a reversal trade, otherwise it would just sell my position to 0.) input shortMAlength = 9; def shortMA = ExpAverage(length = shortMAlength, data = CLOSE); def buy = shortMA > longMA; addOrder(OrderType.BUY_TO_OPEN, buy, name = “BUY”); def sell = shortMA < longMA; addOrder(OrderType.SELL_TO_OPEN, sell, name = “SHORT”); addOrder(OrderType.SELL_TO_OPEN, sell, name = “SHORT”);
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I updated the title of your question so that it describes the context of your request. The title you had: "TOS Strategy Coding" was far too vague and would not assist viewers seeking a similar solution. As to your code. I see a few mistakes. One is that you have duplicated the sell order. That will not help at all. But it will not create the problem you have described. The real problem is being caused by your application of order types. You can get full details here: http://toslc.thinkorswim.com/center/reference/thinkScript/Constants/OrderType.html So there are six order types. And they are meant to be used in pairs. For instance if you want to open a long position and close that same long position you would use these two order types. One for each of the AddOrder() statements:
You see that? One is the entry (TO_OPEN), and the other is the exit (TO_CLOSE). In your code you are using the wrong order type for your sell order. You are using:
And you should be using:
If you wanted a pair of order types to produce a "stop and reverse" type of strategy then you would use these two order types:
When these two order types are used it will cause the strategy to always be in a position. The BUY_AUTO will close out any short position and go long. The SEL_AUTO will close out any long position and go short. Marked as spam
 Posted by Pete Hahn (Questions: 37, Answers: 4118) Answered on July 28, 2019 11:21 am
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