Uhm, I am not so sure we understand eachother. It is for sure a problem with my understunding of the ARIMA platform in JMP.
Let's try to pick it up step by step.
1) If I select the forecast period as 3, is the column Predicted Oxy in your example filled with 3rd period prediction for the related timestamp? i.e. row 3 contains the 3rd period prediction for the same row in Actual Oxy and so on?
2) If this is the case, is it possible to obtain a column showing a predicted value for 1st forecast period and one for the 2nd forecasting period as well for all timestamp points in the table and not only for the last one?
Sorry for the confusion and thanks for your patience.