R: Generate frequency table of missing values.

freq.na {questionr} | R Documentation

## Generate frequency table of missing values.

### Description

Generate a frequency table of missing values as raw counts and percentages.

### Usage

    freq.na(data, ...)

### Arguments

`data` | either a vector or a data frame object
`...` | if `x` is a data frame, the names of the variables to examine or keywords to search for such variables. See `lookfor` for more details.

### Value

The result is an object of class data.frame.

### See Also

`table`, `is.na`

### Examples

    data(hdv2003)
    ## Examine a single vector.
    freq.na(hdv2003$qualif)
    ## Examine a data frame.
    freq.na(hdv2003)
    ## Examine several variables.
    freq.na(hdv2003, "nivetud", "trav.satisf")
    ## To see only variables with the most number of missing values
    head(freq.na(hdv2003))

[Package questionr version 0.6.3 Index]