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

From   Margaret MacDougall <>
Subject   Re: st: Calculation of consistency-based intra-class correlation coefficient in Stata
Date   Tue, 11 Jun 2013 12:32:11 +0100

Dear Jeph

Thank you for this valued suggestion. I am sorry that I have just managed to return to it today due to travel commitments. I noted that on applying the command, I was invited to install the relevant module. I in turn found it enlightening to type "help icc23". Just in case in other list users are interested, it appears that the data layout required by Stata for calculating ICCs is different from that required by SPSS. However, there is an impressive command entitled 'reshape' in Stata which helps prepare the way!

Hope this extra info will be of help to someone

Best wishes


Dr Margaret MacDougall
Medical Statistician and Researcher in Education
Centre for Population Health Sciences
University of Edinburgh Medical School
Teviot Place
Edinburgh EH8 9AG

Tel:  +44 (0) 131 650 3211
Fax:  +44 (0) 131 650 6909

On 31/05/2013 14:45, Jeph Herrin wrote:

findit icc23


On 5/31/2013 9:34 AM, Margaret MacDougall wrote:

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


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