To reach the best evaluation, experts generally chart the RSI on a daily time frame rather than hourly. However, sometimes shorter hourly periods are charted to indicate whether it is a good idea to make a short-term asset purchase. Once these numbers are charted, analysts compare them against other factors, such as the undersold or underbought values. On a chart, RSI assigns stocks a value between 0 and 100. in the late 1970s his 'New Concepts in Trading Systems' (1978) is now an investment-lit classic. The relative strength index was created by J.