Given a vector:

> S <- c(1,1,0,0,1,1,-1,-1,-1,0,1)

Then I expected lag(S) to give...

c(1,0,0,1,1,-1,-1,-1,0,1)

but instead...

> S
 [1]  1  1  0  0  1  1 -1 -1 -1  0  1
> lag(S)
 [1]  1  1  0  0  1  1 -1 -1 -1  0  1
attr(,"tsp")
[1]  0 10  1
>

This is very odd.  What is happening?

I get what I using S[-1] so I have no problem, but I obviously do not
understand some thing!

Worik

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