Today, NumXL 1.57 SINGA has gone into Beta testing in preparation for official release, which is about a week away.
In addition to numerous fixes, NumXL 1.57 comes with an important feature: seasonal adjustment for time series using X11 / X12-ARIMA methodology.
The X11/X12-ARIMA (x12a) is developed by the U.S. Census Bureau, but NumXL brings the vast functionality of the x12a program into Excel through a friendly user interface and add-in functions. As a result, an Excel user can run a time series seasonal adjustment and/or forecast in a snap. Furthermore, NumXL offers access to all raw files (input/output) that are generated in the process shall a user wish to examine them manually.
Why not develop x11/x12a natively in NumXL? X12a has a long history. Scores of bright people worked on it, and they continue to support and enhance it further. The program and the methodology have gained wide acceptance in many applications. Why reinvent the wheel? We believe there is enormous value in just bridging the gap between Excel users and this great application.
Do I need to download anything to use X12-ARIMA with NumXL? No. You don’t need to download or install any program other than NumXL. Our installer will copy the supported version of the X12-ARIMA program.
I have X12-ARIMA already installed, do I need to uninstall it first? No. NumXL will only call/invoke the X12 program that was installed by the setup program.