[R] For loop - how to assign "i" when it is not an element of an index?

[Scotty Nelson]

Hello,

I'm trying to build a for loop, where I estimate a series of models with
different sets of (time series) data.
However my for loop doesn't recognize the "i" 

##################### code################
window.1=anomalies.CAK[(positions(anomalies.CAK)>=timeDate("1/1/1971") &
positions(anomalies.CAK)<=timeDate("6/30/1991") )]
....
window.14=anomalies.CAK[(positions(anomalies.CAK)>=timeDate("1/1/1984") &
positions(anomalies.CAK)<=timeDate("6/30/2004") ),]

for (i in 1:14){
	ar1mods[1] = lm ( formula = window.i~ ar(1) )
}
################################# end code ###################

Problem: Object "window.i" not found 

Anybody have a quick tip on what I'm doing wrong?

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