R: Test If a Variable Contains Only Two Unique Values

IsDichotomous {DescTools} | R Documentation

## 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. `NA`s can be skipped by setting `na.rm` to `TRUE`.

### Usage

    IsDichotomous(x, strict = FALSE, na.rm = FALSE)

    Flags(x, na.rm = FALSE)

### 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`.

### Details

IsDichotomous tests a single variable. Flags returns the names of all the dichotomous variables in a list or data.frame.

### Value

`TRUE` if `x` contains only two unique values, `FALSE` else

### Author(s)

Andri Signorell <andri@signorell.net>

### Examples

    IsDichotomous(sample(10, 5, replace=TRUE))

[Package DescTools version 0.99.24 Index]