Get first value based on datetime variable

Source: R/filter.R

Get first value based on datetime variable

filter_date_first(.data, date_var)

Arguments

.data

data which contains datetime or other comparable variable
date_var

datetime or other comparable variable

Value

The row which is the first (by which.min) in the .date

See also

Other date functions: calc_age(), filter_date_last(), filter_date_nearest()

Examples

if (FALSE) {
# searching for the first event of the each class (for each individual):
dat %>%
  filter(!is.na(label)) %>%
  group_by(personid,label) %>%
  filter_date_first(adm_date)
}