Strength SPX500 EURUSD XAUUSD USOIL

study("Strength SPX500 EURUSD XAUUSD USOIL", precision=3)
fast=input(5)
slow=input(15)
v1=security('SPX500/USOIL',period,close)
v2=security('SPX500/XAUUSD',period,close)
v3=security('SPX500/EURUSD',period,close)
v4=security('USOIL/EURUSD',period,close)
v5=security('XAUUSD/EURUSD',period,close)
v6=security('XAUUSD/USOIL',period,close)
SPX=(v1+v2+(v3))/3
EUR=((100-v3)+(100-v4)+(100-v5))/3
XAU=((100-v2)+(v5)+v6)/3
OIL=((100-v1)+(v4)+v6)/3
spx=tsi(SPX,fast,slow)
eur=tsi(EUR,fast,slow)
xau=tsi(XAU,fast,slow)
oil=tsi(OIL,fast,slow)
plot(spx,color=green,title='SPX500')
plot(eur,color=fuchsia,title='EURUSD')
plot(xau,color=orange,title='XAUUSD')
plot(oil,color=aqua,title='USOIL')
hline(0,title='midpoint')
hline(0.5,title='overbought')
hline(-0.5,title='oversell')