Original indicator: viewtopic.php?f=17&t=3664
Formulas:
Up=EMA(EMA((WP-EMA(WP))/StdDev(WP))),
Dn=EMA(Up), where
EMA - exponential moving average with period [Length],
StdDev - standard deviation with period [Length],
WP - weighted price ((high+low+close+close)/4).
Download: