roundSAS is an alternative rounding function, ensuring that decimals equal or bigger than 5 are rounded upwards to the nearest number and returned as character vector.

## Arguments

- x
Numeric vector.

- digits
An integer specifying the number of decimal places to be displayed after rounding. Default is 0.

- as_char
logical value indicating conversion of rounded numerical vector to character vector; default is FALSE

- na_char
A character string indicating missing value; if not specified, "NA" is created

## Details

At the midpoint of a decimal place (e.g. 0.5, 1.5), the round function in R rounds to the nearest even number (i.e. 0.5 is rounded to 0; 1.5 is rounded to 2), whereas SAS rounds to the nearest number (i.e. 0.5 is rounded to 1; 1.5 is rounded to 2). The roundSAS function is an alternative rounding function for R that ensures rounding to the nearest number, as done in SAS. roundSAS comes from this Stack Overflow post https://stackoverflow.com/questions/12688717/round-up-from-5

## Examples

```
### input data vector with midpoint decimals
x <- c(-2.5, -1.5, -0.5, 0.5, 1.5, 2.5)
### rounds to integer
roundSAS(x, digits = 0)
#> [1] -3 -2 -1 1 2 3
### input data vector with a missing value
y <- c(8.65, 8.75, NA, 9.85, 9.95)
### rounds to tenths and label the missing value with "NE"
roundSAS(y, digits = 1, as_char = TRUE, na_char = "NE")
#> [1] "8.7" "8.8" "NE" "9.9" "10.0"
```