One way holdout, a splitFunction in the sense of vtreat::buildEvalSets.

Source: R/outOfSample.R

Note one way holdout can leak target expected values, so it should not be preferred in nested modeling situations. Also, doesn't respect nSplits.

oneWayHoldout(nRows, nSplits, dframe, y)

Arguments

nRows

number of rows to split (integer >1).
nSplits

number of groups to split into (ignored).
dframe

original data frame (ignored).
y

numeric outcome variable (ignored).

Value

split plan

Examples


oneWayHoldout(3,NULL,NULL,NULL)

#> [[1]]
#> [[1]]$train
#> [1] 2 3
#> 
#> [[1]]$app
#> [1] 1
#> 
#> 
#> [[2]]
#> [[2]]$train
#> [1] 1 3
#> 
#> [[2]]$app
#> [1] 2
#> 
#> 
#> [[3]]
#> [[3]]$train
#> [1] 1 2
#> 
#> [[3]]$app
#> [1] 3
#> 
#> 
#> attr(,"splitmethod")
#> [1] "oneway"