I think it should be
var(y[i-3:i-1,])
instead of
var(x[i-3:i-1,])
otherwise the values of the vector are overwritten
Best wishes,
Matthias
marlene marchena schrieb:
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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