Does anyone know the start dates for PsychSignal and Sentdex?
The covered timespan for each dataset is listed in the documentation.
So, looking at the PsychSignal docs (https://www.quantopian.com/docs/data-reference/psychsignal#properties) it shows "Timespan: July 2009 to present.". The data starts in July 2009.
Looking at the Sentdex docs (https://www.quantopian.com/docs/data-reference/sentdex#properties) it shows "Timespan: June 2013 to present". The data starts in June 2013.
Another date to note... There is also listed a "Point-In-Time Start" for each dataset. This is when Quantopian began getting the live feed and timestamping the data. This is important because it reflects when this data would have been available to actually impact trading. Before this date, Quantopian used historical files to populate the dataset and assumed some constant offset (typically a day) as the timestamp. After this date the timestamps reflect actuals. It is sometimes informative to run one's backtest before and after the "Point-In-Time Start" date.
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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.