jayy

ADX Trend Strength Leaf_West style

This is a slightly different way of plotting ADX used by Leaf_West at http://tradingwithleafwest.net/ The criteria for plotting this version of ADX are described in the Educational Info pdfs on the Website.
This is my attempt to replicate Leaf_West's presentation of ADX .
Use of the indicator is described in detail in the Educational info pdfs: http://tradingwithleafwest.net/
I have used ADX (8) and DMI(9) for a best fit.. Leaf's methods evolve as time goes on and
The BATS data feed has the usual issues affecting the plots, a realtime data feed is the way to go. Credit for the original ADX and DMI script goes to Greeny

Jayy
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// This is a different way of plotting ADX used by Leaf_West at http://tradingwithleafwest.net/.  
// The criteria for plotting ADX are described in the educational info.  
// This is my attempt to replicate Leaf_West's indicator.
// The BATS data feed has the usual issues.  Realtime data is the way to go.
// Credit for the original ADX and DMI script goes to Greeny


study("Trend Strength/ADX Leaf_West style", shorttitle=" Trend Strength ADX LW")
LWadxlength = input(8, title="ADX period")
LWdilength = input(9, title="DMI Length")

dirmov(len) =>
	up = change(high)
	down = -change(low)
	truerange = rma(tr, len)
	plus = fixnan(100 * rma(up > down and up > 0 ? up : 0, len) / truerange)
	minus = fixnan(100 * rma(down > up and down > 0 ? down : 0, len) / truerange)
	[plus, minus]

adx(LWdilength, LWadxlength) => 
	[plus, minus] = dirmov(LWdilength)
	sum = plus + minus
	adx = 100 * rma(abs(plus - minus) / (sum == 0 ? 1 : sum), LWadxlength)
	[adx, plus, minus]

[ADX, up, down] = adx(LWdilength, LWadxlength)
LWADX= (ADX-15)*2.5
adxcolor= up>down?green: red
plot(LWADX, color=adxcolor, title="Trend Strength")
plot (LWADX, color=adxcolor , style= histogram, linewidth= 4)

plot(0, color=black, title="Chop Zone")
plot(20, color=green, title="Mendoza Line", linewidth=1)
plot(100, color=red, title=" Extreme Zone", linewidth=1)