code: def var_aggregate(x, ddof):
      squares, totals, counts = list(zip(*x))
      x2, x, n = float(sum(squares)), float(sum(totals)), sum(counts)
      result = (x2 / n) - (x / n) ** 2
      return result * n / (n - ddof)
  
imports: from __future__ import annotations
label_desc: Use image node_id 6 for calling a global function with example usage: var_aggregate(x, ddof) and returns: unknown