# \donttest{
wti <- crudeoil[-1,1]
drivers <- (lag(crudeoil[,-1],k=1))[-1,]
ld.wti <- (diff(log(wti)))[-1,]
ld.drivers <- (diff(log(drivers)))[-1,]
tvp <- tvp(y=ld.wti,x=ld.drivers,V=1,lambda=0.99)
# graphics.off()
plot(tvp)
# }
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