moving average TTR

Hello,

I used the TTR package in R to calculate moving averages. I have a monthly
time series and I would like to calculate the moving average over 10 years
with an offset of 1 year.
It should be something like      sma.365 <- SMA(data, n=120)

Does anyone know how to include in offset?


Thanks a lot for your help.

Best regards!

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