code: def _sturges_formula(dataset, mult=1):
      
      return int(np.ceil(mult * np.log2(dataset.draw.size)) + 1)
docs: Use Sturges' formula to determine number of bins.
  
      See https://en.wikipedia.org/wiki/Histogram#Sturges'_formula
      or https://doi.org/10.1080%2F01621459.1926.10502161
  
      Parameters
      ----------
      dataset: xarray.DataSet
          Must have the `draw` dimension
  
      mult: float
          Used to scale the number of bins up or down. Default is 1 for Sturges' formula.
  
      Returns
      -------
      int
          Number of bins to use