For each variable in a tbl_summary table, the add_n function adds a column with the total number of non-missing (or missing) observations

# S3 method for tbl_summary
add_n(
  x,
  statistic = "{n}",
  col_label = "**N**",
  footnote = FALSE,
  last = FALSE,
  ...
)

# S3 method for tbl_svysummary
add_n(
  x,
  statistic = "{n}",
  col_label = "**N**",
  footnote = FALSE,
  last = FALSE,
  ...
)

Arguments

x

Object with class tbl_summary from the tbl_summary function or with class tbl_svysummary from the tbl_svysummary function

statistic

String indicating the statistic to report. Default is the number of non-missing observation for each variable, statistic = "{n}". Other statistics available to report include:

  • "{N_obs}" total number of observations,

  • "{N_nonmiss}" number of non-missing observations,

  • "{N_miss}" number of missing observations,

  • "{p_nonmiss}" percent non-missing data,

  • "{p_miss}" percent missing data

  • survey summaries also have the following unweighted statistics available: "N_obs_unweighted", "N_miss_unweighted", "N_nonmiss_unweighted", "p_miss_unweighted", "p_nonmiss_unweighted"

The argument uses glue::glue syntax and multiple statistics may be reported, e.g. statistic = "{N_nonmiss} / {N_obs} ({p_nonmiss}%)"

col_label

String indicating the column label. Default is "**N**"

footnote

Logical argument indicating whether to print a footnote clarifying the statistics presented. Default is FALSE

last

Logical indicator to include N column last in table. Default is FALSE, which will display N column first.

...

Not used

Value

A tbl_summary or tbl_svysummary object

Example Output

Example 1

Author

Daniel D. Sjoberg

Examples

# Example 1 ----------------------------------
tbl_n_ex <-
  trial[c("trt", "age", "grade", "response")] %>%
  tbl_summary(by = trt) %>%
  add_n()