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calculate cumsum for input level
cumsum_by_level(input_tree, level_num, attri_name)
tree with calculated cumsum for input level
input tree
level of tree for cumsum
name of this cummulative count field
data(exercise_df) exercise_node <- data.tree::as.Node(exercise_df) cumsum_by_level(exercise_node, 3, "exercise_time")
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