code: def getValue(self):
      ret = None
      if self.windowFull():
          ret = self.__getValueAtImpl(self._timestamps.data()[-1])
      return ret
  
imports: from pyalgotrade import technical
  from pyalgotrade.utils import collections
  from pyalgotrade.utils import dt
  import numpy
  from scipy import stats
label_desc: Use image node_id 5 for calling the LeastSquaresRegressionWindow obj's underlying member method code with example usage: obj.getValue() and returns: ret