Where is X-12-ARIMA? Mohamad June 05, 2013 17:11 Follow Starting with NumXL version 1.60 (Apache), the X-12-ARIMA toolbar icon has moved from the toolbar to a ARMA drop-down menu (see the image below). Related articles Why does the calibration function in NumXL shows the constraint's rhs of 0.9999? Can I compute the logarithmic return from a time series without any intermediate calculations? How do I use NumXL functions in my Excel sheet? X12-ARIMA Challenges and Workarounds General Exponential Smoothing (GESMTH) with trend, seasonality and Chatfield adjustment.