how to get history from fetcher and data object simultaneously?

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how to get history from fetcher and data object simultaneously?

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Getting Started Fetcher Using Data

Hello everyone. I have an external file with earnings dates history.
E.g. https://www.dropbox.com/s/yh4xkuy804c2cne/earnings_dates_history.csv?dl=0

I am trying to calculate average price path before the earnings reports for different stocks for each earnings date.

I know how to implement this in notebooks. Below is an example of what I’m trying to achieve. Is there a way to do the same in backtest? The problem is that I can’t access data.history from initialize method. Any help is appreciated.

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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.