code: def test_three_chr_versus_regenie(spark):
      compare_linreg_to_regenie(
          spark, "test_lin_out_3chr_", single_chr=False
      )
  
imports: import functions
  import numpy
  import statsmodels.api
  import pandas
  import glow.gwas.functions
  import glow.gwas.lin_reg
  import pytest
label_desc: Use image node_id 43 for calling a global function with example usage: test_three_chr_versus_regenie(spark) without return types