R: Define indicators for data

indicator {validate} | R Documentation

## Define indicators for data

### Description

An indicator maps a data frame, or each record in a data frame to a number. The purpose of this class is to store and apply expressions that define indicators.

### Usage

    indicator(..., .file, .data)

### Arguments

`...` | A comma-separated list of indicator definitions
`.file` | (optional) A character vector of file locations

### See Also

`syntax`, `add_indicators`

### Examples

    # create an indicator for the number of missing x in data set

    I <- indicator(
     sum(is.na(.))               # number of missing variables
     , sum(is.na(.[c("x","y")])) # number of missing x and y
     , mean(is.na(.))            # fraction of missing variables
     , sum(x)
     , mean(x)
    )

    dat <- data.frame(x=1:2, y=c(NA,1))
    C <- confront(dat, I)
    values(C)

[Package validate version 1.1.1 Index]