class_docstr: Inherits time series methods from TSM class.
  
  **** GENERALIZED AUTOREGRESSIVE SCORE E(X)OGENOUS VARIABLE (GASX) MODELS ****
  
  Parameters
  ----------
  data : pd.DataFrame or np.array
      Field to specify the time series data that will be used.
  
  formula : string
      patsy string describing the regression
  
  ar : int
      Field to specify how many AR lags the model will have.
  
  sc : int
      Field to specify how many score lags terms the model will have.
  
  integ : int (default : 0)
      Specifies how many time to difference the time series.
  
  dist : str
      Which distribution to use
docstr: Creates model latent variables
  
  Returns
  ----------
  None (changes model attributes)
docstr_tok: ["Creates","model","latent","variables","Returns","--","--","--","--","--","None","(","changes","model","attributes",")"]
code: def _create_latent_variables(self):
      """Creates model latent variables
  
      Returns
      ----------
      None (changes model attributes)
      """
  
      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),
          )
  
imports: import sys
  import numpy
  import pandas
  import scipy.stats
  import scipy.special
  from patsy import dmatrices, dmatrix, demo_data
  from ..None import families
  from ..None import tsm
  from ..None import data_check
  from .gas_core_recursions import gasx_recursion
label_desc: Use image node_id 3 for calling the GASX obj's underlying member method code with example usage: obj._create_latent_variables() without return types