R: Tidy a kappa object from a Cohen's kappa calculation

kappa_tidiers {broom} | R Documentation

## Tidy a kappa object from a Cohen's kappa calculation

### Description

Tidy a "kappa" object, from the `cohen.kappa` function in the psych package. This represents the agreement of two raters when using nominal scores.

### Usage

    ## S3 method for class 'kappa'
    tidy(x, ...)

### Arguments

`x` | An object of class "kappa"
`...` | extra arguments (not used)

### Details

Note that the alpha of the confidence interval is determined when the `cohen.kappa` function is originally run.

### Value

A data.frame with columns

`type` | Either "weighted" or "unweighted"
`estimate` | The estimated value of kappa with this method
`conf.low` | Lower bound of confidence interval
`conf.high` | Upper bound of confidence interval

### See Also

`cohen.kappa`

### Examples

    library(psych)

    rater1 = 1:9
    rater2 = c(1, 3, 1, 6, 1, 5, 5, 6, 7)
    ck <- cohen.kappa(cbind(rater1, rater2))

    tidy(ck)

    # graph the confidence intervals
    library(ggplot2)
    ggplot(tidy(ck), aes(estimate, type)) +
        geom_point() +
        geom_errorbarh(aes(xmin = conf.low, xmax = conf.high))

[Package broom version 0.4.2 Index]