Dear R-user

Suppose I have the following data

 y=c(2,1,5,8,11,3,1,7,50,21,33,7,60)

x=data.frame(y)

for(i in 4:nrow(x)) x[i,] =var(x[i-3:i-1,])

I'm trying to get a new variable with the variance of the 3 previous values
(just an example) and with NA in the three first positions. I know that my
for() is wrong
but I'm not able to find my error.

Any idea?

Thanks,

Marlene.

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