IsDichotomous: Test If a Variable Contains Only Two Unique Values
Description
Test if a variable contains only two values. The variable does not need to be a numerical value, factors and logicals are supported as well. NAs can be skipped by setting na.rm to TRUE.
Usage
IsDichotomous(x, strict = FALSE, na.rm = FALSE)
Flags(x, na.rm = FALSE)
Value
TRUE if x contains only two unique values, FALSE else
Arguments
x
a numeric or integer vector, a logical vector or a factor (ordered and unordered)
strict
logical. If set to TRUE, the result will only be TRUE, if x contains exactly 2 levels. If set to FALSE the result will be TRUE for 1 and for 2 levels.
na.rm
logical, indicating whether NA values should be stripped before the computation proceeds. Defaults to FALSE.
Author
Andri Signorell <andri@signorell.net>
Details
IsDichotomous tests a single variable. Flags returns the names of all the dichotomous variables in a list or data.frame.