code: def test__norm_plot_pos():
      result = ros._norm_plot_pos([1, 2, 3, 4])
      expected = numpy.array([0.159104, 0.385452, 0.614548, 0.840896])
      npt.assert_array_almost_equal(result, expected)
  
imports: from statsmodels.compat.pandas import assert_series_equal, assert_frame_equal
  from io import StringIO
  from textwrap import dedent
  import numpy
  import numpy.testing
  import numpy
  from numpy.testing import assert_equal
  import pandas
  import pytest
  from statsmodels.imputation import ros
label_desc: Use image node_id 6 for calling a global function with example usage: test__norm_plot_pos() without return types