tidy.rsplit: Tidy Resampling Object

In rsample: General Resampling Infrastructure

Description

The tidy function from the broom package can be used on rset and rsplit objects to generate tibbles with which rows are in the analysis and assessment sets.

Usage

## S3 method for class 'rsplit'
tidy(x, unique_ind = TRUE, ...)

## S3 method for class 'rset'
tidy(x, ...)

## S3 method for class 'vfold_cv'
tidy(x, ...)

## S3 method for class 'nested_cv'
tidy(x, ...)

Arguments

x	A rset or rsplit object
unique_ind	Should unique row identifiers be returned? For example, if FALSE then bootstrapping results will include multiple rows in the sample for the same row in the original data.
...	Not currently used.

Details

Note that for nested resampling, the rows of the inner resample, named inner_Row, are relative row indices and do not correspond to the rows in the original data set.

Value

A tibble with columns Row and Data. The latter has possible values "Analysis" or "Assessment". For rset inputs, identification columns are also returned but their names and values depend on the type of resampling. vfold_cv contains a column "Fold" and, if repeats are used, another called "Repeats". bootstraps and mc_cv use the column "Resample".

Examples

library(ggplot2)
theme_set(theme_bw())

set.seed(4121)
cv <- tidy(vfold_cv(mtcars, v = 5))
ggplot(cv, aes(x = Fold, y = Row, fill = Data)) +
  geom_tile() + scale_fill_brewer()

set.seed(4121)
rcv <- tidy(vfold_cv(mtcars, v = 5, repeats = 2))
ggplot(rcv, aes(x = Fold, y = Row, fill = Data)) +
  geom_tile() + facet_wrap(~Repeat) + scale_fill_brewer()

set.seed(4121)
mccv <- tidy(mc_cv(mtcars, times = 5))
ggplot(mccv, aes(x = Resample, y = Row, fill = Data)) +
  geom_tile() + scale_fill_brewer()

set.seed(4121)
bt <- tidy(bootstraps(mtcars, time = 5))
ggplot(bt, aes(x = Resample, y = Row, fill = Data)) +
  geom_tile() + scale_fill_brewer()

dat <- data.frame(day = 1:30)
# Resample by week instead of day
ts_cv <- rolling_origin(dat, initial = 7, assess = 7,
                        skip = 6, cumulative = FALSE)
ts_cv <- tidy(ts_cv)
ggplot(ts_cv, aes(x = Resample, y = factor(Row), fill = Data)) +
  geom_tile() + scale_fill_brewer()

Example output

Loading required package: tidyr

rsample documentation built on May 8, 2021, 9:06 a.m.