bin                     Bin a numeric vector and return integer codes
                        for the binning (corresponds to Stata command
                        xtile)
demean                  Demean a vector
elapsed                 Elapsed dates (monthly, quarterly)
fill_gap                Add rows corresponding to gaps in some variable
find_duplicates         returns duplicated rows
floor_date              floor_date Round date-times down.
graph                   Experimental function to graph a dataset
join                    Join two data.tables together
lead-lag                lead and lag with respect to a time variable
pastem                  String and expression interpolation
roll_lag                Apply rollling functions with respect to a time
                        variable
sample_mode             Statistical mode
setdrop                 Drop certain columns in place
setkeep                 Keep only certain columns in place
setmutate               Version of mutate that (i) transforms
                        data.table in place (ii) allows by, i condition
setmutate_each          Version of mutate_each that (i) transforms
                        data.table in place (ii) allows by, i condition
                        (iii) when only when fun, creates new variables
                        - except when replace = TRUE
setna                   fill NA in place based on non missing
                        observations
statar                  A package for applied research
sum_up                  Gives summary statistics (corresponds to Stata
                        command summarize)
tag                     Creates a vector of zero except for one
                        subscript
tempname                Create unique names within a list, a
                        data.frame, or an environment
winsorize               Winsorize a numeric vector
