I would like to be able to compare different ratios in my pipeline and therefore need to make them all dimensionless.
How do I perform demean() on a column rather than a row? Therefore allowing me to demean() all the value of each factor for every company in my universe rather than getting a useless demean of lots of factors for each company.
Any help is much appreciated.
Hi Sam,
Unfortunately, there isn't a built-in column-wise demean() function in pipeline. However, you should be able to write a CustomFactor that takes the mean of a column and subtracts it from each element. Are you familiar with custom factors in pipeline? If not, lesson 10 in the Pipeline Tutorial is a good place to start learning about them.
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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.
