code: def _create_latent_variables(self):
          
  
          for ar_term in range(self.ar):
              self.latent_variables.add_z('AR(' + str(ar_term+1) + ')', fam.Normal(0,0.5,transform=None), fam.Normal(0,3))
  
          for sc_term in range(self.sc):
              self.latent_variables.add_z('SC(' + str(sc_term+1) + ')', fam.Normal(0,0.5,transform=None), fam.Normal(0,3))
  
          for parm in range(len(self.X_names)):
              self.latent_variables.add_z('Beta ' + self.X_names[parm], fam.Normal(0,3,transform=None), fam.Normal(0,3))
docs: Creates model latent variables
  
          Returns
          ----------
          None (changes model attributes)