Hi guys !

This is my first post and i have a sort of a dumb question :

Do the time serie need to be stationary in order to model it to ARMA ??

actually i'm trying to modelise "DEATHS.tsm" with ITSM and i have calculated \nabla\nabla^{12}X_{t}

but when i do the tests of randomness, and exactly the ljung-box test the p-value is : 0.011

should i continue and modelise it ???

Thnx in advance