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Mistake in notebook
Marco Lazure
posted Aug 3, 2016

Hello I don't know where to report this so I'll just write it here. I found a mistake in notebook Quantopian Lecture Series: Discrete and Continuous Random Variables.

In the area where W portfolio gets calculated, the Y_weight is calculated wrong because it returns 0 while it should return float point number.

Y_quantity = 20
Z_quantity = 50
Y_weight = Y_quantity/(Y_quantity + Z_quantity)
This obviously isn't 0.

Solution to this could be:
Y_weight = Y_quantity/((Y_quantity + Z_quantity)*1.0)

Now plotting of W portfolio makes sense because before it was equal to Z stock, since Y_weight was counted as 0 :)

Thank you

2 responses
Gil Wassermann
Aug 3, 2016

Hey Marek,

Thanks so much for flagging this up! Will get right to changing it!

Best,

Gil

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Marco Lazure
Aug 3, 2016

glad to help, I am surprised no one noticed this before

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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.