code: def _SC_FluctAnal_2_dfa_50_1_2_logi_prop_r1(X):
      # Proportion of slower timescale fluctuations that scale with DFA (50%
      # sampling).
      cs = np.zeros(int(len(X) / 2))
      cs[0] = X[0]
      for i in range(1, len(cs)):
          cs[i] = cs[i - 1] + X[i * 2]
  
      return _fluct_prop(cs, len(X), True)
  
imports: import math
  import numpy
  from sktime.utils.numba.njit import njit
label_desc: Use image node_id 33 for calling a global function with example usage: _SC_FluctAnal_2_dfa_50_1_2_logi_prop_r1(X) and returns: _fluct_prop