code: def cronbach(itemscores):
      itemvars = itemscores.var(1, None, None, 1)  # (axis=1, ddof=1)
      tscores = itemscores.sum(0)  # (axis=0)
      nitems = len(itemscores)
      return (
          nitems
          / (nitems - 1)
          * (1 - itemvars.sum() / tscores.var(None, None, None, 1))
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: cronbach(itemscores) and returns: unknown