# intraclass correlation

1. ### Intraclass Correlation Coefficient: Single Measures or Average Measures

For our research we use Intraclass correlations (ICC's), but I can't figure out wether I need to use the Single Measures-value or the Average Measures-value. Our study: 10 children with a rare metabolic disease wore an activity tracker (kind of fitbit) for two weeks, with the first week being...
2. ### Reliability in health and disease (ICC,CoV) - Separtely or combined

I am currently writing an article. However, I have a concern regarding my statistics part. I calculated the ICC (Intraclass correlation) and CoV (Coefficient of Variation) over the group of healthy subjects and over the diseased subjects (measurement within two weeks) and they both are good to...
3. ### Notation of Variance of Residuals in Multilevel Modeling

I am having some trouble to understand the notation of variance of residuals in multilevel modeling . In this paper "Sufficient Sample Sizes for Multilevel Modeling" , in p.87 below equation (3) , they mentioned " the variance of residual errors u_{0j} and u_{1j} is specified as...
4. ### Reliability between sets - is the intraclass correlation coefficient appropriate?

Hi, I am having trouble applying the ICC to data I have collected for my Masters thesis. I have collected 8 sets (of 30 samples) from 40+ participants. Data was collected with constant parameters for all participants in order to find the reliability of the instrument in question. (To clarify...
5. ### Comparing Cronbach's alpha intraclass correlations with varying rater permutations

I've done a study for my PhD comparing different methods/conditions that might affect inter-rater agreement when rating the creativity of other people's drawings. I had 600+ drawings that needed to be rated, so it wasn't feasible to have the same few people rate all the drawings. So 24 raters...
6. ### Intraclass correlations

I am doing a study to investigate the interrater reliability of a rating scale. I solicited 100 teachers to complete a rating scale on a child and then have another teacher complete the same rating scale on the same child. The rating scale uses ordinal ratings (i.e., 0, 1, 2, 3) and consists...
7. ### ICC - Between subject variability

Dear all, I have a twofold question. 1) I'm doubting on how I calculated my between subject variability for a pre/post test design. What I did is dividing my subject mean square (MSb) by the grand mean. Is that correct? 2) I have normalized the data (for each subject, always same way fro...