Arima Model Creation Help

[pauliet987]

Hello, 

I am trying to make an Arima Model to predict how many positive cases will occur the next week based on all previous number of labs performed in previous weeks Example:

Week_Start     Labs_Performed  Number_of_Positive_Cases

11/04/2018.         230                        31

11/11/2018.             260                    45

There is about 6 months worth of data but all put into a weekly format. How do I make an arima model to accomplish this. Thank you for any help you can give! 

[Rick_SAS · Accepted solution]

A great place to start is the Getting Started example for the ARIMA procedure in SAS/ETS software. Work your way through the example, but use your real data. When you get the FORECAST statement for making predictions, it sounds like you want to make a 1-step forecast for the next week:
forecast lead=1 interval=week id=week_start out=results;