Set rules for rounding ties

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)

Arguments

rspec	a rounding_specification object (see round_spec).

Value

an object of class rounding_specification.

See also

Other rounding helpers: round_using_magnitude()

Examples

# 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"