This indicator is a ported MQL5 indicator from http://www.mql5.com/ru/code/749 (in Russian).
Formulas:
IBS=MA(CurIBS),
CurIBS=100*(Close-Low)/Range, if [Price]="Close-Low",
CurIBS=100*(High-Close)/Range, if [Price]="High-Close", where
Range=High-Low.
Download:
For this indicator must be installed Averages indicator from viewtopic.php?f=17&t=2430
The indicator was revised and updated