The SMI Ergodic Indicator is the same as the True Strength Index (TSI) developed by William Blau, except the SMI includes a signal line. The SMI uses double moving averages of price minus previous price over 2 time frames. The signal line, which is an EMA of the SMI, is plotted to help trigger trading signals. Adjustable guides are also given to fine tune these signals. The user may change the input (close), method (EMA), period lengths and guide values. You can use in the xPrice any series: Open, High, Low, Close, HL2, HLC3, OHLC4 and ect...
But it works on other time frames.