Pricing differences

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Pricing differences

Craig Ballantine

posted Jan 28, 2018

Seeking Help Getting Started Research Pipeline

I've created a simple pipeline that uses USEquityPricing.close.latest and USEquityPricing.open.latest. Since I'm new to Python and Quantopian, I wanted to "check my work" -- so I created a Notebook that uses get_pricing, and then I also pulled up a Yahoo Finance page on one of the stocks.

The prices came back different on each of the 3, and I can't understand why.

Any advice / information is appreciated. Thank you in advance.

My Notebook entry (doesn't match up with Yahoo Finance page or my algo):

p=get_pricing('adbe',start_date='2018-01-19',end_date='2018-01-26',frequency='daily')  
p.index.tz = 'US/Eastern'  
p

4 responses

Mustafa Tambawalla

I just ran a simple pipeline with AAPL and got matching pairs for close and open prices between Pipeline and Yahoo. Though the prices weren't exactly the same, they were fairly close in value. Are you asking why the values aren't exactly the same?

Mustafa Tambawalla

My open prices were almost always 100% correct, whereas there was more discrepancy between close prices. Nothing big enough to ruin a strategy in my opinion.

@ Mustafa Tambawalla is correct about the pricing observations. Attached is a notebook which compares the 'get_pricing' , pipeline, and Yahoo data. They all are the same except for closing data sometimes doesn't match perfectly with Yahoo. This however is addressed in the Q FAQs "Why is your close price different from other data sources?" https://www.quantopian.com/faq

Craig Ballantine

@Mustafa Tambawalla / @Dan Whitnable

Thank you both for taking the time to reply. I understand now, after reading the FAQ provided, and understanding that the pipeline gives previous day data. Because of one other screen I had in my pipeline, I only got 1 day of ADBE, and I was trying to compare based on that one day -- which happened to be a day that the close price was off on Yahoo, and I couldn't get the day to match up at all in any of them.

Thanks again for your assistance. Have a great day.

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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.