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| From | Terry Haines <terrence.haines@monash.edu> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: Which ICC to report from iccvar |
| Date | Fri, 24 Jan 2014 14:58:04 +1100 |
I have a stepped wedge, cluster randomised trial of a group education
program. Study participants (id) each had multiple assessments (ax) over
the study year and are nested within school (school). The iccvar I ran
after using
xtmixed returned multiple ICC values. I would like to know which one I
should report (or both) when reporting the result of this trial as normally
only one ICC value is reported? iccvar output is below.
. iccvar
Intraclass Correlation Estimates
Harmonic Mean of Level 2 Units per Level 3 Unit = 2.367
Harmonic Mean of Level 3 Units per Level 4 Unit = 10.375
ICC Std. Err. [95% Conf. Interval]
school 0.00000 . . 1.00000
id 0.57872 2.57990 0.00000 1.00000
ax 0.28393 2.93062 0.00000 1.00000
Many thanks,
Terry Haines
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