Creates the ts.model's process desc
model_process_desc(desc)
A vector<string>
with a list of descriptive values to label the estimate matrix with
A vector<string>
that contains a list of the strings of each process.
This function currently does NOT support ARMA(P,Q) models. That is, there is no support for ARMA(P,Q), AR(P), or MA(Q). There is support for ARMA11, AR1, MA1, GM, WN, DR, QN, and RW.