broom (version 0.4.0)

kappa_tidiers: 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)

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

Details

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

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))