wti <- crudeoil[-1,1]
drivers <- (lag(crudeoil[,-1],k=1))[-1,]
ld.wti <- (diff(log(wti)))[-1,]
ld.drivers <- (diff(log(drivers)))[-1,]
# \donttest{
grl <- c(0.99,0.98,0.97,0.96,0.95)
g <- grid.tvp(y=ld.wti,x=ld.drivers,V=1,grid.lambda=grl)
print(g)
# }
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