Manually combine levels of categorical data.
Examples
upper <- c("secondary", "tertiary")
out <- rbin_factor_combine(mbank, education, upper, "upper")
table(out$education)
#>
#> upper unknown primary
#> 3651 179 691
out <- rbin_factor_combine(mbank, education, c("secondary", "tertiary"), "upper")
table(out$education)
#>
#> upper unknown primary
#> 3651 179 691