Labels:text | screenshot | font OCR: 3. Relative Strenght Index [RSI]. Bj 08 day day E 83 ₺8 38 INTERPRETATION- The Relative Strength Index [RSI] is a popular oscillator used by commodity traders. It was 1st intro- duced by J. Welles Wilder in an article in Futures magazine in June of 1978. The RSI formula is fairly simple to calculat RSI = 100 * (U/U+D) Where U is an average of upward change - When Wilder introduced RSI he grice suggested using_a 14 day RSI. the 9 day and 25 Since then popularity. [ The day RSI have grown to calculate RSI fewer days of RSI in the more volatile it is used