# Looking for help with ITSM software (or other comparable software)

I'm looking for someone who is familiar with the ITSM software. I have some data that needs to be fit with an ARIMA/SARIMA model and then forecast using Holt-Winters/Seasonal method. I then need to compare them using RMSE and MAPE.

I'm completely unfamiliar with ITSM and just need some help on the commands required to perform each of the above functions. The ITSM manual that comes with the download was not very helpful.

If ITSM is not your forte, is there another easily available program that would perform all of these functions for me?

• Have you considered using r? The HoltWinters function is in the stats package (auto-installed, I believe), and the astsa package hosts the sarima function. Compared to many statistical software manuals, documentation for R is phenomenal :) – Nick Stauner May 7 '14 at 23:15
• I might just have to. I have figured out how to fit an ARMA model and do the forecasting. I'm just confused if it is even possible to get the RMSE and MAPE values from ITSM. – Ashley May 7 '14 at 23:32