http://www.mathworks.com/help/econ/arma-models.html 

There is an arma function in matlab.... towards which I guess Michael G. sent you...

Hi

I advice you to see these documents. You will find what you need.

I hope that I helped you, let us know if you have another questions or you need more details.

With best regards

http://fr.mathworks.com/help/signal/autoregressive-and-moving-average-models.html

http://fr.mathworks.com/help/econ/moving-average-model.html

http://fr.mathworks.com/help/econ/arma-model.html

Check this one :

https://www.kevinsheppard.com/MFE_Toolbox#Code

You can use system identification toolbox, both GUI of this toolbox and .m functions can be suitable for answering this questions.