Could someone please explain to me why this error happens when I use the simplebeta function in the IDE? Simplebeta works fine in research but runs into a problem in the IDE. Here is the specific error:
TypeError: SimpleBeta() expected a value of type Asset for argument 'target', but got list instead.
You must be using the symbols method define your target security? A never ending source of frustration (though I like to think of it as just another challenge) is in the research environment there is a single symbols method for fetching security objects. In the IDE there are two methods - symbols and symbol. In the IDE symbols always returns a list (so use it when fetching several securities) while symbol returns a single object.
So, this must be similar to what you have working in the research environment
beta = SimpleBeta(target=symbols('AAPL'), regression_length=200), 'beta') The symbols method in this case returns a single object (because it's given a single symbol). The SimpleBeta factor is happy. However, put that same code into the IDE and the SimpleBeta factor throws an error because, in the IDE, the symbols method returns a list. The SimpleBeta factor is not happy.
The solution? Replace symbols with symbol in the IDE.
beta = SimpleBeta(target=symbol('AAPL'), regression_length=200), 'beta') That should do it. Good luck.
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Looks like its working Dan! Thanks for the help.
One question I do have is if the underlying logic has stayed the same by changing it to symbol from symbols. Per your other post I was fetching the correlation of my stocks to the SPY using the following code: market_proxy = symbols('SPY'). This has now been changed to market_proxy = symbol('SPY') - per your post above. My question is if the underlying object being fetched is still entire SPY that I am regressing against to find the simplebeta. Thanks in advance!
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.