code: def wang_ryzin_cdf(h, Xi, x_u):
      ordered = np.zeros(Xi.size)
      for x in np.unique(Xi):
          if x <= x_u:
              ordered += wang_ryzin(h, Xi, x)
  
      return ordered
  
file_path: statsmodels/statsmodels/nonparametric/kernels.py
imports: import numpy
  from scipy.special import erf
label_desc: Use image node_id 10 for calling a global function with example usage: wang_ryzin_cdf(h, Xi, x_u) and returns: ordered