Build a k-fold cross validation splitter, respecting (never splitting) groupingColumn.

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Description

Build a k-fold cross validation splitter, respecting (never splitting) groupingColumn.

Usage

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Arguments

groupingColumnName

name of column to group by.

Value

splitting function in the sense of vtreat::buildEvalSets.

Examples

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d <- data.frame(y=sin(1:100))
d$group <- floor(seq_len(nrow(d))/5)
splitter <- makekWayCrossValidationGroupedByColumn('group')
split <- splitter(nrow(d),5,d,d$y)
d$splitLabel <- vtreat::getSplitPlanAppLabels(nrow(d),split)
rowSums(table(d$group,d$splitLabel)>0)