multilevel: ICC1 – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

ICC1

Function to Estimate Intraclass Correlation Coefficient 1 or ICC(1) from an aov model

Description

This function calculates the Intraclass Correlation Coefficient 1 or ICC(1) from an ANOVA model. This value is equivalent to the ICC discussed in the random coefficient modeling literature, and represents the amount of individual-level variance that can be "explained" by group membership.

Usage

ICC1(object)

Arguments

object

An ANOVA (aov) object from an one-way analysis of variance.

Value

Provides an estimate of ICC(1) for the sample.

Author(s)

Paul Bliese paul.bliese@moore.sc.edu

References

Bliese, P. D. (2000). Within-group agreement, non-independence, and reliability: Implications for data aggregation and Analysis. In K. J. Klein & S. W. Kozlowski (Eds.), Multilevel Theory, Research, and Methods in Organizations (pp. 349-381). San Francisco, CA: Jossey-Bass, Inc.

Bartko, J.J. (1976). On various intraclass correlation reliability coefficients. Psychological Bulletin, 83, 762-765.

Examples

data(bh1996)
   hrs.mod<-aov(HRS~as.factor(GRP),data=bh1996)
   ICC1(hrs.mod)

multilevel

Multilevel Functions

v2.6

GPL (>= 2)

Authors

Paul Bliese

Initial release

2016-07-26