Report new/novel appearances of character values.

Source: R/vtreat.R

Report new/novel appearances of character values.

novel_value_summary(dframe, trackedValues)

Arguments

dframe

Data frame to inspect.
trackedValues

optional named list mapping variables to know values, allows warnings upon novel level appearances (see track_values)

Value

frame of novel occurrences

See also

prepare.treatmentplan, track_values

Examples


set.seed(23525)
zip <- c(NA, paste('z', 1:10, sep = "_"))
N <- 10
d <- data.frame(zip = sample(zip, N, replace=TRUE),
                zip2 = sample(zip, N, replace=TRUE),
                y = runif(N))
dSample <- d[1:5, , drop = FALSE]
trackedValues <- track_values(dSample, c("zip", "zip2"))
novel_value_summary(d, trackedValues)

#>   row_index column value
#> 1         6    zip  z_10
#> 2         7    zip   z_1
#> 3         6   zip2  z_10
#> 4         8   zip2   z_1