code: def test_methylation_precision(self):
      # R results are from log link_precision
      rslt = self.meth_log_fit
      assert_allclose(
          rslt.params[-2:],
          expected_methylation_precision["Estimate"],
          atol=1e-5,
          rtol=1e-10,
      )
  
imports: import io
  import os
  import pytest
  import numpy
  from numpy.testing import assert_allclose, assert_equal
  import pandas
  import patsy
  from statsmodels.api import families
  from statsmodels.tools.sm_exceptions import ValueWarning
  from statsmodels.othermod.betareg import BetaModel
  from .results import results_betareg
label_desc: Use image node_id 5 for calling the TestBetaModel obj's underlying member method code with example usage: obj.test_methylation_precision() without return types