signif_half_up {janitor}

Round a numeric vector to the specified number of significant digits; halves will be rounded up.

Description

In base R signif(), halves are rounded to even, e.g., signif(11.5, 2) and signif(12.5, 2) are both rounded to 12. This function rounds 12.5 to 13 (assuming digits = 2). Negative halves are rounded away from zero, e.g., signif(-2.5, 1) is rounded to -3.

This may skew subsequent statistical analysis of the data, but may be desirable in certain contexts. This function is implemented from https://stackoverflow.com/a/1581007/; see that question and comments for discussion of this issue.

Usage

signif_half_up(x, digits = 6)

Arguments

x

a numeric vector to round.

digits

integer indicating the number of significant digits to be used.

Examples

signif_half_up(12.5, 2)
signif_half_up(1.125, 3)
signif_half_up(-2.5, 1) # negatives get rounded away from zero