code: def ref_score(tested_var, target_var, covars=None):
      """Compute t-scores with linalg or statsmodels."""
      from nilearn.mass_univariate.tests._testing import (
          get_tvalue_with_alternative_library,
      )
  
      return get_tvalue_with_alternative_library(
          tested_var, target_var, covars
      )
  
imports: import nibabel
  import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal, assert_array_less, assert_equal
  from scipy import stats
  from nilearn.conftest import _rng
  from nilearn.maskers import NiftiMasker
  from nilearn.mass_univariate import permuted_ols
label_desc: Use image node_id 3 for calling a global function with example usage: ref_score(tested_var, target_var, covars) and returns: get_tvalue_with_alternative_library