code: def _handle_data(self, endog, exog, missing, hasconst, **kwargs):
      return Model._handle_data(
          self, endog, exog, missing, hasconst, **kwargs
      )
  
imports: from statsmodels.compat.numpy import lstsq
  from statsmodels.compat.pandas import Appender, Substitution, cache_readonly, call_cached_func, get_cached_doc
  from collections import namedtuple
  import numpy
  from pandas import DataFrame, MultiIndex, Series
  from scipy import stats
  from statsmodels.base import model
  from statsmodels.base.model import LikelihoodModelResults, Model
  from statsmodels.regression.linear_model import RegressionModel, RegressionResults
  from statsmodels.tools.validation import array_like, int_like, string_like
label_desc: Use image node_id 2 for calling the RollingWLS obj's underlying member method code with example usage: obj._handle_data(endog, exog, missing, hasconst) and returns: Model