Z-Score

study("Z-Score")

interv = input(title="Interval", type=integer, defval=1500)

sum = sum(close, interv)/interv
medi = avg(close, interv)
dev = stdev(close, interv)
zs = (close-sum)/dev

plot(zs)

band1 = hline(-2)
band0 = hline(-3)
fill(band1, band0)

band2 = hline(2)
band3 = hline(3)
fill(band2, band3)
hline(0 , color=#F50C17)