tbl_regression sample size in model - gtsummary

Question

Is there a way to add the sample size in the tbl_regression output. Meaning the actual sample used for the model?

#example
tbl_regression(model, exponentiate = TRUE)

Thanks,

#gtsummary

Answer 1

There are two ways to add the model N to a tbl_regression() table.

1. Use modify_header() to include the N in a column header. Requires gtsummary v1.3.6 or higher.
2. Use add_n() to add a column to the table with the number of observations. Requires the current dev version of gtsummary. Install the dev version with remotes::install_github("ddsjoberg/gtsummary")

library(gtsummary)
packageVersion("gtsummary")
#> '1.3.6.9013'

glm(response ~ age, trial, family = binomial) %>%
  tbl_regression(exponentiate = TRUE) %>%
  modify_header(label ~ "**Characteristic, N = {N}**") %>% # Add N to the column header
  add_n() %>%                                              # Add N column to table
  add_nevent()                                             # Add Event N column to table