KrippAlpha {DescTools} R Documentation

## Krippendorff's Alpha Reliability Coefficient

### Description

Calculate the alpha coefficient of reliability proposed by Krippendorff.

### Usage

 KrippAlpha(x, method=c("nominal", "ordinal", "interval", "ratio"))


### Arguments

 x classifier x object matrix of classifications or scores method data level of x

### Value

A list with class '"irrlist"' containing the following components:

 method a character string describing the method. subjects the number of data objects. raters the number of raters. irr.name a character string specifying the name of the coefficient. value value of alpha. stat.name here "nil" as there is no test statistic. statistic the value of the test statistic (NULL). p.value the probability of the test statistic (NULL). cm the concordance/discordance matrix used in the calculation of alpha data.values a character vector of the unique data values levx the unique values of the ratings nmatchval the count of matches, used in calculation data.level the data level of the ratings ("nominal","ordinal", "interval","ratio")

### Note

Krippendorff's alpha coefficient is particularly useful where the level of measurement of classification data is higher than nominal or ordinal. https://bmcmedresmethodol.biomedcentral.com/articles/10.1186/s12874-016-0200-9

### Note

This function was previously published as kripp.alpha() in the irr package and has been integrated here without logical changes, but with some adaptations in the result structure.

### Author(s)

Jim Lemon <jim@bitwrit.com.au>

### References

Krippendorff, K. (1980) Content analysis: An introduction to its methodology. Beverly Hills, CA: Sage.

### See Also

CronbachAlpha, KappaM, CohenKappa

### Examples

# the "C" data from Krippendorff
nmm <- matrix(c(1,1,NA,1,2,2,3,2,3,3,3,3,3,3,3,3,2,2,2,2,1,2,3,4,4,4,4,4,
1,1,2,1,2,2,2,2,NA,5,5,5,NA,NA,1,1,NA,NA,3,NA), nrow=4)

# first assume the default nominal classification
KrippAlpha(nmm)

# now use the same data with the other three methods
KrippAlpha(nmm, "ordinal")
KrippAlpha(nmm, "interval")
KrippAlpha(nmm, "ratio")


[Package DescTools version 0.99.54 Index]