exemplar function

Exemplar observation

Construct a single "exemplar" record from a data frame. For now, all numeric columns (including "Date" objects) are replaced with their corresponding median value and non-numeric columns are replaced with their most frequent value.

exemplar(object)

## S3 method for class 'data.frame'
exemplar(object)

## S3 method for class 'matrix'
exemplar(object)

## S3 method for class 'dgCMatrix'
exemplar(object)

Arguments

• object: A data frame, matrix, or dgCMatrix (the latter two are supported by xgboost).

Returns

A data frame with the same number of columns as object and a single row.

Examples

set.seed(1554)  # for reproducibility
train <- data.frame(
  x = rnorm(100),
  y = sample(letters[1L:3L], size = 100, replace = TRUE,
             prob = c(0.1, 0.1, 0.8))
)
exemplar(train)