Calculates the 6 intra-class correlations for the columns in the matrix or data.frame x, where the columns are typically raters or items, following Shrout and Fleiss (1979).
A matrix or data.frame on which to calculate ICCs of the columns.
This function is the workhorse function for item.ICC and Profile.ICC. It computes the intra-class correlations for a single item and for the composite of the items in the data.frame or matrix x. Of note, the results should be intepreted with extreme caution if values in x are missing. If possible, the best choice is to remove missing values from x first.
A matrix containing the values for the six possible intra-class correlations described by Shrout and Fleiss (1979).
This function is the workhorse function for item.ICC and Profile.ICC. It is rarely used as a stand alone function.
Ryne A. Sherman
Shrout, P. E. & Fleiss, J. L. (1979). Intraclass correlations: Uses in assessing rater reliability. Psychological Bulletin, 86, 420-428
Loading required package: psych Loading required package: abind Loading required package: foreach ICC1 ICC1k ICC2 ICC2k ICC3 ICC3k [1,] 0.1108492 0.1995755 0.1119431 0.2013468 0.1122192 0.2017934
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