st: Calculation of consistency-based intra-class correlation coefficient in Stata

[Margaret MacDougall <Margaret.MacDougall@ed.ac.uk>]

Hello

I am very keen to efficiently tap into the information I require to 
calculate a consistency-based intra-class correlation coefficient (in in 
the notation of Fagot (1993), ICC(3,1)) for a two-way mixed model
in which raters are fixed and subjects are random. SPSS allows for the 
specification of a wide range of types of intra-class correlation 
coefficients, including the one above, by means of simple 
point-and-click menu commands, which can be used to derive corresponding 
syntax. However, I am keen to use Stata in order that I can take 
advantage of other features offered by this package.

I have already carried out a relevant search online and noted a similar 
but more general question to the list which dates back to 2011. The 
response did not provide me with the solution I am looking for, which is 
really just simply how to perform the calculations in Stata for the 
particular type of intra-class correlation (ICC) referred to above.

I look forward to learning from Stata users who can help in this way.

For the purpose of clarity, I would like to point out that I am using 
the expression 'consistency-based', to differentiate from ICCs based on 
absolute agreement.


Many thanks

Best wishes

Margaret

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