code: def test_chandrasekhar_conventional():
      check_univariate_chandrasekhar(filter_univariate=False)
      check_univariate_chandrasekhar(
          filter_univariate=False, concentrate_scale=True
      )
  
      check_multivariate_chandrasekhar(filter_univariate=False)
      check_multivariate_chandrasekhar(
          filter_univariate=False, measurement_error=True
      )
      check_multivariate_chandrasekhar(
          filter_univariate=False, error_cov_type="diagonal"
      )
      check_multivariate_chandrasekhar(
          filter_univariate=False, gen_obs_cov=True
      )
      check_multivariate_chandrasekhar(
          filter_univariate=False,
          gen_obs_cov=True,
          memory_conserve=True,
      )
  
file_path: statsmodels/statsmodels/tsa/statespace/tests/test_chandrasekhar.py
imports: import numpy
  import pandas
  from .results import results_varmax
  from statsmodels.tsa.statespace import sarimax, varmax
  from statsmodels.tsa.statespace.kalman_filter import MEMORY_CONSERVE, MEMORY_NO_LIKELIHOOD
  from numpy.testing import assert_allclose
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_chandrasekhar_conventional() without return types