Retrieve the subset of the data found at a given terminal node

Given a terminal node number, this function returns the data belonging to this terminal node. If the dataType argument is 'all', returns all rows of data from the original dataset that fall in this node. Otherwise, the flattened data that belongs to this node is returned (one row of data per ID, original responses replaced by spline coefficients).

getNodeData(tree, node, dataType = "all")

Arguments

tree	a model returned from splineTree()
node	The number of the node to retrieve data from. Must be valid number of a terminal node. Node numbers can be seen using stPrint(tree) or treeSummary(tree).
dataType	If "all", the data returned is from the original dataset (one row per individual observation with original response values). If "flat", the data returned is the flattened data (one row per person/unit), with individual spline coefficients instead of response values.

Value

A dataframe which holds all the data that falls into this node of the tree.

Examples

# NOT RUN {
split_formula <- BMI ~ HISP + WHITE + BLACK + SEX +
  Num_sibs + HGC_FATHER + HGC_MOTHER
tree <- splineTree(split_formula, BMI~AGE, 'ID', nlsySample, degree=1,
  df=3, intercept=TRUE, cp=0.006, minNodeSize=20)
# }
node6data <- getNodeData(tree, 6, dataType = 'all')
plot(BMI~AGE, data=node6data)