add_weights_cluster     Add a column of cluster survey weights to a
                        data frame.
add_weights_strata      Add a column of stratified survey weights to a
                        data frame. For use in surveys where you took a
                        sample population out of a larger source
                        population, with a simple-random or stratified
                        survey design.
age_categories          Create an age group variable
fac_from_num            create factors from numbers
find_breaks             Automatically calculate breaks for a number
find_date_cause         Find the first date beyond a cutoff in several
                        columns
fmt_ci                  Helper to format confidence interval for text
fmt_count               Counts and proportions inline
gen_polygon             Fake spatial data as polygons This function
                        returns a polygon which is split in to regions
                        based on a supplied vector of names
gen_population          Generate population counts from estimated
                        population age breakdowns.
rename_redundant        Cosmetically relabel all columns that contains
                        a certain pattern
unite_ci                Unite estimates and confidence intervals
zcurve                  Create a curve comparing observed Z-scores to
                        the WHO standard.
