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# skbio.tree.TreeNode.observed_node_counts

`TreeNode.``observed_node_counts`(tip_counts)

  Returns counts of node observations from counts of tip observations

  State: Experimental as of 0.4.1.

  Parameters: | tip_counts (dict of ints) – Counts of observations of tips. Keys correspond to tip names in `self`, and counts are unsigned ints.
  Returns: | Counts of observations of nodes. Keys correspond to node names (internal nodes or tips), and counts are unsigned ints.
  Return type: | dict

  Raises:

  - `ValueError` – If a count less than one is observed.
  - `MissingNodeError` – If a count is provided for a tip not in the tree, or for an internal node.