I want to make X-13 ARIMA-SEATS simulation using seasonal time series data that generate from package 'sim.ssarima'. But in X-13 ARIMA-SEATS require the data must be non-zero and positive value. Whereas 'sim.ssarima' generate random value (positive or negative). How to make it become positive value in R?
Here is my code to generate data:
ARIMA11 <- sim.ssarima(orders = list(ar=c(1,1), i=c(0,0), ma=c(1,1)), lags=c(1,12), frequency=12, obs=120, AR=c(-0.6, -1), MA=c(0.2, 0.1))
data11 <- ARIMA11$data
