Pine Script - AMA Indicator

study("AMA Indicator", shorttitle="AMA", overlay=true)
// Adapative Moving Average, Rev 01
// Source, http://www.mql5.com/en/code/10
// https://getsatisfaction.com/tradingview/topics/ama_indicator
//
// Rewrite for Tradingview "Pine Script" by Kocurekc, May 2014
// https://www.tradingview.com/u/kocurekc/
// Code is provided as public domain, no warranty

LB = input(title="Lookback Period", type=integer, defval=15, minval=2)
ifSC = input(title="Fast Period", type=integer, defval=30, minval=0)
isSC = input(title="Slow Period", type=integer, defval=2, minval=0)

sig = abs(close-close[LB])
noise = sum(abs(close-close[1]),LB)
ER=sig/noise

SC = 2/(LB+1)
fSC = 2/(ifSC+1)
sSC = 2/(isSC+1)
EMA = close*SC + nz(EMA[1])*(1-SC)
SSC = ER*(fSC - sSC) + sSC

AMA = close * pow(SSC,2) + nz(AMA[1]) * (1 - pow(SSC,2))
plot(AMA)