code: def dummies_groups(self, level=0):
      self.dummy_sparse(level=level)
      return self._dummies
  
imports: from statsmodels.compat.python import lrange, lzip
  import numpy
  import pandas
  import statsmodels.tools.data
  from pandas import Index, MultiIndex
label_desc: Use image node_id 15 for calling the Grouping obj's underlying member method code with example usage: obj.dummies_groups(level) and returns: self