In other words, the RSI was designed to measure the speed of price movements, while the stochastic oscillator formula works best in consistent trading ranges. In general, the RSI is more useful ...

Blum, J. (1954). Multidimensional stochastic approximation methods. Annals of Mathematical Statistics, 4, 737–744. Bar-Gera, H., & Boyce, D. (2006). Solving a non-convex combined travel forecasting ...