Programming the statistical procedures from SAS

Intraclass correlation coefficient and its CONFIDENCE LIMITS

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New Contributor
Posts: 4

Intraclass correlation coefficient and its CONFIDENCE LIMITS

Using this macro <> and the instruction provided i was able to obtain the different ICC for my reliability data.

How do I obtain corresponding 95% confidence limits????

Thanks.
New Contributor
Posts: 4

Re: Intraclass correlation coefficient and its CONFIDENCE LIMITS

CORRECTION:

this macro: http://support.sas.com/kb/25/031.html

Using this macro

http://support.sas.com/kb/25/031.html

and the instruction provided i was able to obtain the different ICC for my reliability data.

How do I obtain corresponding 95% confidence limits????

Thanks.
Valued Guide
Valued Guide
Posts: 678

Re: Intraclass correlation coefficient and its CONFIDENCE LIMITS

There are many versions of the ICC, and McGraw and Wong (1999; Psychological Methods, vol. 1, no. 1, pp. 30-46) discuss many of them. They show how to get confidence intervals. This is not built into the macro. A different macro is given in:
http://www.nesug.org/proceedings/nesug07/sa/sa13.pdf
This one calculates a much more limited set of ICCs, but it does give confidence intervals (using one of the possible methods).
New Contributor
Posts: 4

Re: Intraclass correlation coefficient and its CONFIDENCE LIMITS

thanks...

yes, i used the macro that you sent as well... but i switched to the other one cause it offered more ICCs....

but good to know that i was on the right track....
Frequent Contributor
Posts: 77

Re: Intraclass correlation coefficient and its CONFIDENCE LIMITS

In any case, whether the analytical version (i.e. formula) for CI exists or not, you can obtain the CI by bootstrap.

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