format_age_custom: Create consistent, complete customized age groups
In johnrbryant/demprep: Prepare Demographic Data

Description Usage Arguments Details Value See Also Examples

Given a vector of age group labels, create a factor that contains levels for all age groups, as defined by the breaks argument. The labels may include an open age group, ie an age group with no upper limit.

1	format_age_custom(x, breaks = NULL, open_last = TRUE)

`x`	A vector of age group labels.
`breaks`	A vector of strictly increasing integer values.
`open_last`	Whether the final age group has no upper limit. Defaults to `TRUE`.

format_age_custom is the most flexible of the format_age functions in that the age groups can have any combination of widths.

breaks is used to specify the points at which each age group starts and finishes, and open_last is used to specify whether the final age group has an upper limit. If breaks has length n, then the final age group is defined as follows:

`open_last`	Final age group
`TRUE`	[`breaks[n]`, `Inf`)
`FALSE`	[`breaks[n-1]`, `breaks[n]`)

If x contains NA, then the levels of the factor created by format_age_custom also contain NA.

A factor with length equal to x.

Other functions for creating age groups are

format_age_year
format_age_multi
format_age_lifetab
format_age_births
format_age_quarter
format_age_month

date_to_age_year calculates ages from dates.

format_age_custom(x = c(22, 11, 85),
                  breaks = c(0, 15, 45, 70))
format_age_custom(x = c("90+", "19-40", "22", NA),
                  breaks = c(0, 15, 60))
format_age_custom(x = c("50-59", "19-40", "31"),
                  breaks = c(15, 45, 60),
                  open_last = FALSE)