Using the talib.RSI() is "danger"?

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Using the talib.RSI() is "danger"?

posted Jul 16, 2017

I happen to notice that the return values by talib.RSI() is quite different if you chose different data-history length. From the attached notebook one can see, if I chose the date duration from 2017-07-05 to 2017-07-13, the RSI on 07-12 and 07-13 calculated from talib.RSI are 85.00772798 and 88.93115253. If I chose from 2017-06-25 to "2017-07-13, they are 89.75772863 and 92.51841015, though I use the same RSI-period.

My opinion: No matter what a length of date duration, if it's greater than the RSI-period (+1?), the RSI must be the same, right?

2 responses

I've searched in this forum and find out, if the length of the date-history should be rsi-period * 20, the result are the same.

The current rsi is calculated by combining the current rs with the previous rs. The previous rs is the previous combined with the orchids before that. The more data you give it the more accurate (or smoothed) it will be. Rsi calculation ideally uses more data than the rsi period.

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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.