[no subject]
- To: mathgroup at yoda.physics.unc.edu
- From: jwszuhay at drl.mobil.com (J. W. Szuhay [John])
- Date: Fri, 27 Mar 92 08:09:24 -0600
Hello Mathgroup, Has anyone developed a backward shift operator that can be used for times series analysis a la Box Jenkins? I am interested in fitting experimental data to ARMA type models and would like to be able to express these models explicitly in terms of powers of a backward shift operator. Also, I am having trouble getting my NeXT version of Mathematica (v.2.0.3) to recognize Greek symbols. When I flip the font to a Greek character set I find it difficult to flip back to a normal font set (i.e. to mix Greek and normal characters in the same expression). Furthermore, Mathematica does not recognize these characters and returns all normal characters after an evaluation. Appreciate the help, thanks, John W. Szuhay Email: jwszuhay at drl.mobil.coM