class_docstr: Compute effect of treatment using the regression discontinuity method.
  
  Estimates effect by transforming the problem to an instrumental variables
  problem.
  
  Supports additional parameters as listed below.
code: def construct_symbolic_estimator(self, estimand):
      return ""
  
file_path: dowhy/dowhy/causal_estimators/regression_discontinuity_estimator.py
imports: from typing import Any, List, Optional, Union
  import numpy
  import pandas
  from dowhy.causal_estimator import CausalEstimator
  from dowhy.causal_estimators.instrumental_variable_estimator import InstrumentalVariableEstimator
  from dowhy.causal_identifier import IdentifiedEstimand
label_desc: Use image node_id 4 for calling the RegressionDiscontinuityEstimator obj's underlying member method code with example usage: obj.construct_symbolic_estimator(estimand) and returns: str