Back to Community
Getting Started - Open and close prices question

So I was going through the first tutorials, and on tutorial 1.7 where you schedule your orders , you can open to close your position at a specific time in the market.
My question is, does the price fluctuate a lot at week opening or week closure ? I tried to run some algorithms where I delay the buying of the stocks at the beginning of the week by 30 minutes , and I close 30 minutes ahead of closure. It made 3% less profit than if you buy them directly at opening - over the span of 57 months!! I was expecting a much higher difference honestly. ( I allocated 50% of the portfolio in SPYG and 50% in cash).
Maybe this is too basic but I would like to know your opinion on the price fluctuations at week opening and closing.


1 response

Welcome to Quantopian.

That's the exact kind of question that you can answer in a research notebook easily rather than running a bunch of tedious backtests. You can all of the price history, and then slice it by day/hour/day-of-week, whatever you want, and calculate the mean and median and standard dev or whatever you want of the various time periods.


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.