code: def test_chandrasekhar_univariate():
      check_univariate_chandrasekhar(filter_univariate=True)
      check_univariate_chandrasekhar(
          filter_univariate=True, concentrate_scale=True
      )
  
      check_multivariate_chandrasekhar(filter_univariate=True)
      check_multivariate_chandrasekhar(
          filter_univariate=True, measurement_error=True
      )
      check_multivariate_chandrasekhar(
          filter_univariate=True, error_cov_type="diagonal"
      )
      check_multivariate_chandrasekhar(
          filter_univariate=True, gen_obs_cov=True
      )
      check_multivariate_chandrasekhar(
          filter_univariate=True, 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 5 for calling a global function with example usage: test_chandrasekhar_univariate() without return types