How is the back Return calculated?

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How is the back Return calculated?

edited

Hi everyone, considering SPY as the benchmark I am trying to calculate by myself the back return value but I can't get the same number as Quantopian...
My calculations are:
I hold the position from 2011-09-29 to 2014-02-19'
First day(buy): Stock price: 117.08
Last day(sell): Stock price: 183.8
Back Return= (183.8/117.08)-1=56.99%

But the benchmark return's using Quantopian with the same dates is 64.95%

Why is there such a difference? Am I missing something?

Thank you in advance,

2 responses

Quantopian adds dividends to calculate return. During the time period 2011-09-29 to 2014-02-19 SPY paid out roughly $9 in dividends. Therefore the return is ($183.80 + $9) / $117.08 ~ 64%.

Thank you very much Dan! Do you know how to access those dividends in Python?

Thanks again

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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.