Group Monte Carlo cross-validation creates splits of the data based on some grouping variable (which may have more than a single row associated with it). One resample of Monte Carlo cross-validation takes a random sample (without replacement) of groups in the original data set to be used for analysis. All other data points are added to the assessment set. A common use of this kind of resampling is when you have repeated measures of the same subject.
group_mc_cv(
data,
group,
prop = 3/4,
times = 25,
...,
strata = NULL,
pool = 0.1
)A tibble with classes group_mc_cv,
rset, tbl_df, tbl, and data.frame.
The results include a column for the data split objects and an
identification variable.
A data frame.
A variable in data (single character or name) used for
grouping observations with the same value to either the analysis or
assessment set within a fold.
The proportion of data to be retained for modeling/analysis.
The number of times to repeat the sampling.
These dots are for future extensions and must be empty.
A variable in data (single character or name) used to conduct
stratified sampling. When not NULL, each resample is created within the
stratification variable. Numeric strata are binned into quartiles.
A proportion of data used to determine if a particular group is too small and should be pooled into another group. We do not recommend decreasing this argument below its default of 0.1 because of the dangers of stratifying groups that are too small.
data(ames, package = "modeldata")
set.seed(123)
group_mc_cv(ames, group = Neighborhood, times = 5)
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