code: def test_plot_oth(self, close_figures):
      # just test that they run
      res = self.res
      plot_fit(res, 0, y_true=None)
      plot_partregress_grid(res, exog_idx=[0, 1])
      # GH 5873
      plot_partregress_grid(self.res_true, grid=(2, 3))
      plot_regress_exog(res, exog_idx=0)
      plot_ccpr(res, exog_idx=0)
      plot_ccpr_grid(res, exog_idx=[0])
      fig = plot_ccpr_grid(res, exog_idx=[0, 1])
      for ax in fig.axes:
          add_lowess(ax)
  
      close_or_save(pdf, fig)
  
imports: import numpy
  from numpy.testing import assert_array_less, assert_equal, assert_raises
  from pandas import DataFrame, Series
  import pytest
  import statsmodels.api
  from statsmodels.graphics.regressionplots import abline_plot, add_lowess, influence_plot, plot_added_variable, plot_ccpr, plot_ccpr_grid, plot_ceres_residuals, plot_fit, plot_leverage_resid2, plot_partial_residuals, plot_partregress_grid, plot_regress_exog
label_desc: Use image node_id 3 for calling the TestPlot obj's underlying member method code with example usage: obj.test_plot_oth(close_figures) without return types