I am new to Quantopian.
I picked this sample from the Quantopian forum itself and it works i.e. no error, but in backtesting for daily data its showing only one transaction over 5 year period. How to I force it to trade/transact at every cross over.
Welcome!
A moving average strategy is a great way to ease into the platform. Python is a really great language to learn with; very simple syntax and keyword usage. Let's talk about keywords, Python keywords or builtins are words that are used to control the flow of the program, consequently you can't use those in your code as variable names. So above you use long as a variable name, it is not good practice to do this as long is a keyword in Python (for long integer). Also you use sid as an attribute to context, in addition to the Python builtins we define certain keywords, and methods specific to Quantopian that allow us to run your algorithms, sid is one of those, so you shouldn't use except as the method call or as the attribute when appropriate. Check out the API docs for specifics. Finally we encourage people on Quantopian to use order_target_percent instead of a regular order as it helps to prevent over leveraging your account.
I've attached a backtest of your code modified to include order_target_percent, and I changed your moving average parameters as it would have only traded a few times. I hope this helps you get started!
James C
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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.