Rounding a number x to the nearest integer requires some tie-breaking
rule for those cases when x is exactly half-way between two integers,
that is, when the fraction part of x is exactly 0.5. The
round_half_up() function implements a tie-breaking rule that
consistently rounds half units upward. Although this creates a slight
bias toward larger rounded outputs, it is widely used in many disciplines.
The round_half_even() function breaks ties by rounding to the nearest
even unit.
round_half_up(rspec)
round_half_even(rspec)a rounding_specification object (see round_spec).
an object of class rounding_specification.
Other rounding helpers:
round_using_magnitude()
# note base R behavior rounds to even:
round(0.5) # --> 0
#> [1] 0
round(1.5) # --> 2
#> [1] 2
round(2.5) # --> 2
#> [1] 2
# make rspec that rounds up
rspec <- round_half_up(round_spec())
rspec <- round_using_decimal(rspec, digits = 0)
# check
table_value(0.5, rspec) # --> 1
#> [1] "1"
table_value(1.5, rspec) # --> 2
#> [1] "2"
table_value(2.5, rspec) # --> 3
#> [1] "3"
# make rspec that rounds even
rspec <- round_half_even(round_spec())
rspec <- round_using_decimal(rspec, digits = 0)
# check
table_value(0.5, rspec) # --> 0
#> [1] "0"
table_value(1.5, rspec) # --> 2
#> [1] "2"
table_value(2.5, rspec) # --> 2
#> [1] "2"