irrICC (version 1.0)

icc1b.fn: Intraclass Correlation Coefficient (ICC) under ANOVA Model 1B.

Description

This ICC is associated with the one-factor ANOVA model where each rater may rate a different group of subjects. This ICC represents a global measure of intra-rater reliability coefficient for all raters involved in the experiment.

Usage

icc1b.fn(ratings)

Arguments

ratings

This is a data frame containing 3 columns or more. The first column contains subject numbers (there could be duplicates in subject numbers if a subject was rated multiple times) and each of the remaining columns is associated with a particular rater and contains its numeric ratings.

Value

This function returns a list containing the following 9 values: 1. sig2r: the rater variance component. 2. sig2e: the error variance component. 3. icc1b: the ICC/intra-rater reliability coefficient 4. n: the number of subjects. 5. r: the number of raters. 6. max.rep: the maximum number of ratings per subject. 7. min.rep: the minimum number of ratings per subjects. 8. M: the total number of ratings for all subjects and raters. 9. ov.mean: the overall mean rating.

References

See equation 8.2.4 of chapter 8 in Gwet, 2014: Handbook of Inter-Rater Reliability - 4th ed.

Examples

# NOT RUN {
#iccdata1 is a small dataset that comes with the package. Use it as follows:
library(irrICC)
iccdata1 #see what the iccdata1 dataset looks like
icc1b.fn(iccdata1)
coeff <- icc1b.fn(iccdata1)$icc1b #this only gives you the ICC coefficient
coeff
# }