My pipeline is finding 5 "growing" stocks a day and allocating 20% of my remaining cash to each of those stocks. When the stock goes above or below 2% of the buyprice, it should sell. For some reason my code seems to be overselling and putting my in a short position and eventually messing up my whole algo. Why is it shorting?
The root of your problem is in order management. You have some sell logic in handle_data which runs every minute. But you aren't checking if your order is being filled. Everything works fine when orders fill right away. But if there is no volume in a minute, or for many minutes, then the orders just stack on top of each other, and when they fill, they fill incompletely. Your business logic thrashes back from long to short as the orders flush through.
One option is to check for open orders before placing a new order.
A better option is to take advantage of the new Optimize API which takes care of all of that order management for you.
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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian.
In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.