search for: statitonary

...a composed of 24 values: myinput = c(n1,n2...,n24); # In order to make a forecasting a, I use the following codes result1 = arima(ts(myinput),order = c(p,d,q),seasonal = list(order=c(P,D,Q))) result2 = forecast(result1,12) plot(result2) Now, by using R code... 1) How can I determine if my data is statitonary or not ? (trend & seasonal effects) 2) If not, how can I make it stationary ? 3) Is arima() function used only on STATIONARY data ? Or does it first determine if the data is stationary or not and makes it stationary ? (if it is non-stationary) 4) I tried different parameter values in arima() fu...